Class 6 Exam > Class 6 Notes > Mathematics (Maths) Class 6 > RD Sharma Solutions: Understanding Three Dimensional Shapes (Exercise 16.1)
Understanding Three Dimensional Shapes (Exercise 16.1) RD Sharma Solutions | Mathematics (Maths) Class 6 PDF Download
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Page 1
1. Name any four objects from your environment, which have the form of
(i) a cuboid (ii) a cube
Solution:
(i) The objects which have the form of a cuboid are a compass box, a lunch box, a duster and a book.
(ii) The objects which have the form of a cube are a chalk box, a disc, a tissue box and a cubical cabin.
2. Draw a diagram to represent a cuboid. Label its vertices as P, Q, R, S, T, U, V and W. Now write the
names of its faces and its edges.
Solution:
The diagram of a cuboid is given below
The faces of a cuboid are
The bottom face – PQRS
The top face – TUVW
The back face – WSRV
The left face – TPSW
The right face - UVRQ
The front face - TPQU
The edges of a cuboid are
(PQ, QR, RS, SP), (TU, UV, VW, WT), (WS, SR, RV, VW) and (UV, VR, RQ, QU)
3. Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G and H. Now write the names
of its faces and edges.
Solution:
The diagram of a cube is as follows:
Page 2
1. Name any four objects from your environment, which have the form of
(i) a cuboid (ii) a cube
Solution:
(i) The objects which have the form of a cuboid are a compass box, a lunch box, a duster and a book.
(ii) The objects which have the form of a cube are a chalk box, a disc, a tissue box and a cubical cabin.
2. Draw a diagram to represent a cuboid. Label its vertices as P, Q, R, S, T, U, V and W. Now write the
names of its faces and its edges.
Solution:
The diagram of a cuboid is given below
The faces of a cuboid are
The bottom face – PQRS
The top face – TUVW
The back face – WSRV
The left face – TPSW
The right face - UVRQ
The front face - TPQU
The edges of a cuboid are
(PQ, QR, RS, SP), (TU, UV, VW, WT), (WS, SR, RV, VW) and (UV, VR, RQ, QU)
3. Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G and H. Now write the names
of its faces and edges.
Solution:
The diagram of a cube is as follows:
We know that a cube has 6 faces and 12 edges.
The faces of a cube are
ABCD, EFGH, BCGF, ADHE, ABFE and CDHG.
The edges of a cube are
AB, BC, CD, DA, EF, FG, GH, HE, BF, CG, AE and HD
4. Fig. 16.2 represents a cuboid. The lengths of the edges AE, EF, and FG are indicated as l, b and h
respectively. Indicated the lengths of all other edges.
Solution:
It is given that the lengths of the edges AE, EF and FG are indicated as l, b and h respectively. The lengths of all
other edges are as follows
AE = DH = BF = CG = l
EF = HG = AB = DC = b
FG = EH = BC = AD = h
5. In Fig. 16.2, if the face EFGH is taken as the base, the name the lateral faces. Also, name the line segment
representing the height of the cuboid.
Page 3
1. Name any four objects from your environment, which have the form of
(i) a cuboid (ii) a cube
Solution:
(i) The objects which have the form of a cuboid are a compass box, a lunch box, a duster and a book.
(ii) The objects which have the form of a cube are a chalk box, a disc, a tissue box and a cubical cabin.
2. Draw a diagram to represent a cuboid. Label its vertices as P, Q, R, S, T, U, V and W. Now write the
names of its faces and its edges.
Solution:
The diagram of a cuboid is given below
The faces of a cuboid are
The bottom face – PQRS
The top face – TUVW
The back face – WSRV
The left face – TPSW
The right face - UVRQ
The front face - TPQU
The edges of a cuboid are
(PQ, QR, RS, SP), (TU, UV, VW, WT), (WS, SR, RV, VW) and (UV, VR, RQ, QU)
3. Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G and H. Now write the names
of its faces and edges.
Solution:
The diagram of a cube is as follows:
We know that a cube has 6 faces and 12 edges.
The faces of a cube are
ABCD, EFGH, BCGF, ADHE, ABFE and CDHG.
The edges of a cube are
AB, BC, CD, DA, EF, FG, GH, HE, BF, CG, AE and HD
4. Fig. 16.2 represents a cuboid. The lengths of the edges AE, EF, and FG are indicated as l, b and h
respectively. Indicated the lengths of all other edges.
Solution:
It is given that the lengths of the edges AE, EF and FG are indicated as l, b and h respectively. The lengths of all
other edges are as follows
AE = DH = BF = CG = l
EF = HG = AB = DC = b
FG = EH = BC = AD = h
5. In Fig. 16.2, if the face EFGH is taken as the base, the name the lateral faces. Also, name the line segment
representing the height of the cuboid.
Solution:
The lateral faces for the base EFGH are
AEHD, AEFB, BFGC and DHGC
The line segments representing the height of the cuboid are
AE or DH or BF or CG
6. In Fig. 16.2, name the four diagonals of the cuboid.
Solution:
CE, BH, AG and DF are the four diagonals of a cuboid.
7. In Fig. 16.2, name the
(i) face parallel to BFGC
(ii) faces adjacent to BFGC
(iii) three edges which meet in the vertex G.
Page 4
1. Name any four objects from your environment, which have the form of
(i) a cuboid (ii) a cube
Solution:
(i) The objects which have the form of a cuboid are a compass box, a lunch box, a duster and a book.
(ii) The objects which have the form of a cube are a chalk box, a disc, a tissue box and a cubical cabin.
2. Draw a diagram to represent a cuboid. Label its vertices as P, Q, R, S, T, U, V and W. Now write the
names of its faces and its edges.
Solution:
The diagram of a cuboid is given below
The faces of a cuboid are
The bottom face – PQRS
The top face – TUVW
The back face – WSRV
The left face – TPSW
The right face - UVRQ
The front face - TPQU
The edges of a cuboid are
(PQ, QR, RS, SP), (TU, UV, VW, WT), (WS, SR, RV, VW) and (UV, VR, RQ, QU)
3. Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G and H. Now write the names
of its faces and edges.
Solution:
The diagram of a cube is as follows:
We know that a cube has 6 faces and 12 edges.
The faces of a cube are
ABCD, EFGH, BCGF, ADHE, ABFE and CDHG.
The edges of a cube are
AB, BC, CD, DA, EF, FG, GH, HE, BF, CG, AE and HD
4. Fig. 16.2 represents a cuboid. The lengths of the edges AE, EF, and FG are indicated as l, b and h
respectively. Indicated the lengths of all other edges.
Solution:
It is given that the lengths of the edges AE, EF and FG are indicated as l, b and h respectively. The lengths of all
other edges are as follows
AE = DH = BF = CG = l
EF = HG = AB = DC = b
FG = EH = BC = AD = h
5. In Fig. 16.2, if the face EFGH is taken as the base, the name the lateral faces. Also, name the line segment
representing the height of the cuboid.
Solution:
The lateral faces for the base EFGH are
AEHD, AEFB, BFGC and DHGC
The line segments representing the height of the cuboid are
AE or DH or BF or CG
6. In Fig. 16.2, name the four diagonals of the cuboid.
Solution:
CE, BH, AG and DF are the four diagonals of a cuboid.
7. In Fig. 16.2, name the
(i) face parallel to BFGC
(ii) faces adjacent to BFGC
(iii) three edges which meet in the vertex G.
Solution:
(i) AEHD is the face parallel to BFGC
(ii) BCDA, DCGH, ABFE, and EFGH are the faces adjacent to BFGC
(iii) Three edges which meet in the vertex G are CG, GH and GF
8. Fill in the blanks to make the following statements true:
(i) A cuboid has …… vertices.
(ii) A cuboid has …… edges
(iii) A cuboid has ……. Faces.
(iv) The number of lateral faces of a cuboid is ……..
(v) A cuboid all of whose edges are equal is called a …….
(vi) Two adjacent faces of a cuboid meet in a line segment called its …….
(vii) Each edge of a cuboid can be obtained as a line segment in which two …… meet.
(viii) ……edges of a cube (or cuboid) meet at each of its vertices.
(ix) A ……. is a cuboid in which all the six faces are squares.
(x) The three concurrent edges of a cuboid meet at a point called the …... of the cuboid.
Solution:
(i) A cuboid has eight vertices
(ii) A cuboid has twelve edges
(iii) A cuboid has six faces
(iv) The number of lateral faces of a cuboid is four
(v) A cuboid all of whose edges are equal is called a cube
(vi) Two adjacent faces of a cuboid meet in a line segment called its edge
(vii) Each edge of a cuboid can be obtained as a line segment in which two adjacent faces meet
(viii) Three edges of a cube (or cuboid) meet at each of its vertices.
Page 5
1. Name any four objects from your environment, which have the form of
(i) a cuboid (ii) a cube
Solution:
(i) The objects which have the form of a cuboid are a compass box, a lunch box, a duster and a book.
(ii) The objects which have the form of a cube are a chalk box, a disc, a tissue box and a cubical cabin.
2. Draw a diagram to represent a cuboid. Label its vertices as P, Q, R, S, T, U, V and W. Now write the
names of its faces and its edges.
Solution:
The diagram of a cuboid is given below
The faces of a cuboid are
The bottom face – PQRS
The top face – TUVW
The back face – WSRV
The left face – TPSW
The right face - UVRQ
The front face - TPQU
The edges of a cuboid are
(PQ, QR, RS, SP), (TU, UV, VW, WT), (WS, SR, RV, VW) and (UV, VR, RQ, QU)
3. Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G and H. Now write the names
of its faces and edges.
Solution:
The diagram of a cube is as follows:
We know that a cube has 6 faces and 12 edges.
The faces of a cube are
ABCD, EFGH, BCGF, ADHE, ABFE and CDHG.
The edges of a cube are
AB, BC, CD, DA, EF, FG, GH, HE, BF, CG, AE and HD
4. Fig. 16.2 represents a cuboid. The lengths of the edges AE, EF, and FG are indicated as l, b and h
respectively. Indicated the lengths of all other edges.
Solution:
It is given that the lengths of the edges AE, EF and FG are indicated as l, b and h respectively. The lengths of all
other edges are as follows
AE = DH = BF = CG = l
EF = HG = AB = DC = b
FG = EH = BC = AD = h
5. In Fig. 16.2, if the face EFGH is taken as the base, the name the lateral faces. Also, name the line segment
representing the height of the cuboid.
Solution:
The lateral faces for the base EFGH are
AEHD, AEFB, BFGC and DHGC
The line segments representing the height of the cuboid are
AE or DH or BF or CG
6. In Fig. 16.2, name the four diagonals of the cuboid.
Solution:
CE, BH, AG and DF are the four diagonals of a cuboid.
7. In Fig. 16.2, name the
(i) face parallel to BFGC
(ii) faces adjacent to BFGC
(iii) three edges which meet in the vertex G.
Solution:
(i) AEHD is the face parallel to BFGC
(ii) BCDA, DCGH, ABFE, and EFGH are the faces adjacent to BFGC
(iii) Three edges which meet in the vertex G are CG, GH and GF
8. Fill in the blanks to make the following statements true:
(i) A cuboid has …… vertices.
(ii) A cuboid has …… edges
(iii) A cuboid has ……. Faces.
(iv) The number of lateral faces of a cuboid is ……..
(v) A cuboid all of whose edges are equal is called a …….
(vi) Two adjacent faces of a cuboid meet in a line segment called its …….
(vii) Each edge of a cuboid can be obtained as a line segment in which two …… meet.
(viii) ……edges of a cube (or cuboid) meet at each of its vertices.
(ix) A ……. is a cuboid in which all the six faces are squares.
(x) The three concurrent edges of a cuboid meet at a point called the …... of the cuboid.
Solution:
(i) A cuboid has eight vertices
(ii) A cuboid has twelve edges
(iii) A cuboid has six faces
(iv) The number of lateral faces of a cuboid is four
(v) A cuboid all of whose edges are equal is called a cube
(vi) Two adjacent faces of a cuboid meet in a line segment called its edge
(vii) Each edge of a cuboid can be obtained as a line segment in which two adjacent faces meet
(viii) Three edges of a cube (or cuboid) meet at each of its vertices.
(ix) A cube is a cuboid in which all the six faces are squares
(x) The three concurrent edges of a cuboid meet at a point called the vertex of the cuboid.
9. In each of the following, state if the statement is true (T) or false (F):
(i) Number of faces in a cuboid and the number of faces in a cube are equal.
(ii) A cube has twelve vertices.
Solution:
(i) True
(ii) False
10. For the cuboid shown in Fig. 16.3,
(i) What is the base of this cuboid?
(ii) What are the lateral faces of this cuboid?
(iii) Name one pair of opposite faces. How many pairs of opposite faces are there? Name them.
(iv) Name all the faces of this cuboid which have X as a vertex. Also, name those which have VW as a side
(v) Name the edges of this cuboid which meet at the vertex P. Also, name those faces which meet at this
vertex.
Solution:
(i) The base of this cuboid is UVWX
(ii) The lateral faces of this cuboid are UXSP, QVWR, SXWR and UVQP
(iii) One pair of opposite faces among the lateral faces of the base are PQVU and SXWR or UXSP and QVWR.
We know that a cuboid has two pairs of opposite faces among the lateral faces of the base.
(iv) The faces of this cuboid which have vertex as X are UVWX, UXSP and SXWR.
The faces having VW as a side are UVWX and QVWR
(v) The edges of this cuboid meeting at the vertex P are UP, PQ and PS.
The faces which meet at this vertex P are PQRS, UPSX and PQVU
11. The dimensions of a cuboid with vertices A, B, C, D, E, F, G and H are as shown in Fig. 16.4.
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