Question

Q.1 Find the area of square whose perimeter is 84cm.​

Answer 1

$\huge\mathcal\red{Answer}$

Side =

$\frac{perimeter}{4} = \frac{84}{4} \\ side \: = \: 21$

Area of square =

$side {}^{2} or \: side \: \times side \\ 21 {}^{2} = 441$

So, area of square

$441 \: cm {}^{2}$

Answer 2

• Given

• Perimeter of square = 84 cm

• To find

• Area of square

• Concept

• We are having the value of perimeter of square. Firstly, we will find the side of the square by using the formula of perimeter of square.
• Then, by using the formula to find the area of square we will get our answer.

• Solution

Using formula,

Perimeter of square = 4 × s

where,

• s = sides

Substituting the values,

⟶ 84 = 4 × side

⟶ 84/4 = side

⟶ 21 = side

Side of the square = 21 cm

A square has all sides equal to each other.

Therefore, each side of square = 21 cm

Using formula,

Area of square = side²

Substituting the values,

⟶ 21 × 21

⟶ 441 cm²

Therefore, Area of square = 441 cm²