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Ques 1: Match the column B with A and C:
A  B  C 
(a) Straight angle  (i) An angle whose measure is less than 90°.  (f) One fourth of a revolution. 
(b) Right angle  (ii) An angle whose measure is between 90° and 180°.  (g) Half of a revolution. 
(c) Acute angle  (iii) An angle whose measure is 180°.  (h) More than half a revolution 
(d) Obtuse angle  (iv) An angle whose measure is 90°.  (i) Less than onefourth of a revolution. 
(e) Reflex angle  (v) An angle whose measure is between 180° and 360°.  (j) Between ¼ and ½ of a revolution. 
For example (a) → (iii) → (g)
Ans: (a) → (iii) → (g)
(b) → (iv) → (f)
(c) → (i) → (i)
(d) → (ii) → (j)
(e) → (v) → (h)
Ques 2: A sailor is rowing a boat due north. In which direction will he be rowing if he turns it through (i) a straight angle (ii) a complete angle
Ans: (i) South
(ii) North
Ques 3: You are standing in a classroom facing north. In what direction will you be facing after making a quarter turn in clockwise direction?
Ans: East
Ques 4: Write five capital letters of the English alphabet which show perpendicular lines/line segments.
Ans: E, F, H, I, J, L, T (any five)
Ques 5: Identify the following triangles according to the measurement of sides and angles given. Also mention the type of triangle:
(e.g. (1) ∆ABC is an equilateral triangle and acute angled triangle.
Ans: (1) ∆ABC: Equilateral and acute angled triangle
(2) ∆DEF: Isosceles triangle and acute angled triangle
(3) ∆GIH: Scalene triangle and right angled triangle
(4) ∆JKL: Isosceles triangle and obtuse angled triangle
(5) ∆MNO: Scalene triangle and obtuse angled triangle
(6) ∆PQR: Scalene triangle and acute angled triangle
(7) ∆STV: Isosceles triangle and right angled triangle
Ques 6: Fill in the blanks:
(a) Each angle of a rectangle is a ____________ angle.
(b) ____________ sides of a rhombus are of equal length.
(c) In a ____________, there is only one pair of parallel sides.
(d) The ____________ sides of a rectangle are equal in length.
(e) A rhombus with four right anlges is called a ____________.
(f) The polygon with least number of sides is ____________.
Ans: (a) Right angle
(b) All
(c) Trapezium
(d) Opposite
(e) Square
(f) Triangle
Ques 7: Complete the following table:
(One is done as examplesphere)
Shape  Example  Number of faces  Number of vertices  Number of Edges  
(1)  Cuboid  —  —  —  — 
(2)  Cube  —  —  —  — 
(3)  Triangular pyramid  —  —  —  — 
(4)  Sphere  Football  No face  No vertex  No edge 
Ans:
Shope  Example  No. of Faces  No. of vertices  No. of edges 
Cuboid  Math book  6  8  12 
Cube  Die  6  8  12 
Triangular Pyramid  Egypt Pyramid  4  4  6 
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