Question

Find the missing side of a rectangle if
A. Perimeter = 20 cm, L = 6 cm.
B. Perimeter = 46 cm, L = 12 cm.
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Answer 1

Step-by-step explanation:

A.

Given :- l=6cm, p=20cm

Perimeter=2(l+b)

20=2(6+b)

2(6+b)=20

6+b=20/2

6+b=10

b=10-6

b=4cm

B.

Given :- l=12cm, p=46cm

Perimeter=2(l+b)

46=2(12+b)

2(12+b)=46

12+b=46/2

12+b=23

b=23-12

b=11cm

Answer 2

Answer:

A. 4

B. 11

Step-by-step explanation:

A. Sum of two parallel sides

L + L = 6+6 = 12

Sum of remaining parallel sides

B+B = Perimeter- (L+L) = 20- 12 = 8

So 2B = 8

So B = 4

B. Similar to previous answer,

L+L = 24, so B+B =46-24 = 22

So B = 11