Question

a square has a perimeter of 20 cm if each side is doubled what is the new area?

Answer 1

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Perimeter = 20 meters

Perimeter = 4 ×sides

So,

Sides = 5 meters

ATQ

Sides r doubled so new sides = 10 meters

$area = {side}^{2}$

$area = {10}^{2}$

Area = 100 Ans....

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Answer 2

Step-by-step explanation:

Question :-

A square has a perimeter of 20cm if each side had its length doubled what is the new area?

Solution:-

Find It

what is the new area?

Given:-

A square has a perimeter of 20cm if each side

According to the Question

Let be the length and be the breadth.

GIVEN,

$\bf \: length \times breadth \: = 20$

When both of doubled.

$\bf \: l = 2l \\ \bf \: b = 2b$

where l' and b' are the increased sides

Formula

$\bf \: new \: area \: = l \times b$

according to the Question

each side had its length doubled

$\bf \: 2l \times 2b = 4(l \times b) \\ \bf \red{ 4 \times 20 = 80 {cm}^{2} }$

Hence

$\bf \: The \: new \: Area \: Is \: \red{ 80 {cm}^{2} }$