Question

What is the area of the rectangle with perimeter 16cm and length is 5 cm ?

Answer 1

Answer:

15 cm²

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Step-by-step explanation:

to find the area, we need the length and breadth.

since we only know the length and perimeter, we must first find the breadth.

p = 2(l+b)

16 = 2(5+b)

16 = 10 + 2b

2b = 16-10

b = 6/2

b = 3

now that we know the breadth, we can find the area.

area = l * b

= 5 x 3

= 15.

Answer 2

let the unknown breadth be x .

perimeter =16

2(5+x)=16

5+x=16/2

5+x=8

x=8-5

x=3

breadth=3 cm.

Area =l×b

=5×3=15 cm sq.