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Ques 1: Match the column B with A and 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 one-fourth 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
Ques 3: You are standing in a class-room facing north. In what direction will you be facing after making a quarter turn in clockwise direction?
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
Ques 7: Complete the following table:
(One is done as example-sphere)
Number of faces
Number of vertices
Number of Edges
No. of Faces
No. of vertices
No. of edges