Page 111 - Revised Maths Wisdom Class - 6

Perimeter and Area 109

120
So, when an equilateral triangle is formed, length of each side will be 3 = 40 cm
120
When a square is formed, length of each side = = 30 cm
4
120
When a pentagon is formed, length of each side = = 24 cm
5
120
When a hexagon is formed, length of each side = = 20 cm
6
120
When a octagon is formed, length of each side = 8 = 15 cm

120
When a decagon is formed, length of each side = = 12 cm
10
120
When a dodecagon is formed, length of each side = = 10 cm
12

Exercise 7A
Exercise 7A
1. Find the perimeter of each of the following triangles.

(a) (b) (c) (d)

2. Find the perimeter of each of the following figures.

2 m
5 cm 3 m
8 cm 6 cm 4 cm 4 cm 4 cm 4 cm 2 m 1 m 3 m
2 m
4 cm
6 cm 2 cm 2 cm 4 cm 4 cm 1 m 1 m 4 m
4 cm
2 m
6 cm 7 cm 2 cm 2 cm 4 cm 4 cm 1 m 4 m 4 m
9 cm 1 cm 1 cm 4 cm 4 cm 8 m 4 m
4 cm 4 cm
(a) (b) (c) (d) (e)
3. Find the perimeter of each of the following figures.

0.5 m

10 m 12 m 25 m
5 m 5 m 20 cm
10 m 15 m 25 m
(a) (b) (c) (d)

4. Find the perimeter of the following rectangles:
(a) l = 16.25 m, b = 10.5 m (b) l = 7 m 15 cm, b = 2m 25 cm

5. Find the perimeter of the squares with sides:
3
(a) 0.25 m (b) m (c) 60.5 cm
4