RS Aggarwal Class 8 Chapter 14 Exercise 14b Solution

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RS Aggarwal Class 8 Exercise 14b

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1: How many diagonals are there in a pentagon?
(a) 5
(b) 7
(c) 6
(d) 10

2: How many diagonals are there in a hexagon?
(a) 6
(b) 8
(c) 9
(d) 10

3: How many diagonals are there in an octagon?
(a) 8
(b) 16
(c) 18
(d) 20

4: How many diagonals are there in a polygon having 12 sides?
(a) 12
(b) 24
(c) 36
(d) 54

5: A polygon has 27 diagonals. How many sides does it have?
(a) 7
(b) 8
(c) 9
(d) 12

6: The angles of a pentagon are x⁰, (x+20)⁰, (x+40)⁰, (x+60)⁰ and (x+80)⁰. The smallest angle of the pentagon is
(a) 75⁰
(b) 68⁰
(c) 78⁰
(d) 85⁰

7: The measurement each exterior angle of a regular polygon is 40⁰. How many sides does it have?
(a) 8
(b) 9
(c) 6
(d) 10

8: Each interior angle of a polygon is 108⁰. How many sides does it have?
(a) 8
(b) 6
(c) 5
(d) 7

9: Each interior angle of a polygon is 135⁰. How many sides does it have?
(a) 8
(b) 7
(c) 6
(d)10

10: In a regular polygon, each interior angle is thrice the exterior angle. The number of sides of the polygon is
(a) 6
(b) 8
(c) 10
(d) 12

11: Each interior angle of a regular decagon is
(a) 60⁰
(b) 120⁰
(c) 144⁰
(d) 180⁰

12: The sum of all interior angles of a hexagon is
(a) 6 right angles
(b) 8 right angles
(c) 9 right angles
(d) 12 right angles

13: The sum of all interior angles of regular polygon is 1080⁰. What is the measure of each of the interior angles?
(a) 135⁰
(b) 120⁰
(c) 156⁰
(d) 144⁰

14: The interior angle of a regular polygon exceeds its exterior angle by 108⁰. How many sides does the polygon have?
(a) 16
(b) 14
(c) 12
(d) 10.