Question

If the perimeter of a square is $40\text{cm}$, its area is :

• A. $1600{\text{cm}}^2$
• B. $100{\text{cm}}^2$
• C. $1000{\text{cm}}^2$
• D. $\text{none of these}$

Answer 1

The correct option is B

$100{\text{cm}}^2$

Perimeter of square $=40\text{cm}$

And side of square $=\text{perimeter÷4=40÷4=10 cm}$

We know that area of the square $={\text{side×side=10×10=100 cm}}^2$

Hence option(B) is the correct answer and all other options are incorrect answers .