Question

(a)
find the length of one side of a square if its perimeter is 20 cm find the length of a rectangle whose perimeter is 90 cm and breadth is 20 CM ​

Answer 1

Answer:

Perimeter of Square is 4× Side

4×(side) = 20 cm

side = 20/4 = 5cm

Perimeter of rectangle = 2(l+b)

2(l+b) = 90cm

2(l+20) = 90cm

2l = 50cm

l = 25cm

Answer 2

Perimeter of square = 4× side

20 = 4× side

20/4 = side

5 = side

Therefore side of square is 5 cm

Perimeter of rectangle = 2× l+2×b

90 = 2×l +2×20

90 = 2l + 40

90-40 = 2l

50 = 2l

50/2 = l

25 = l

Therefore the length of rectangle is 25 cm