Question

Find the area of square whose diagonal is 21√2 cm.

• A. $484$cm^2$$
• B. $441$cm^2$$
• C. $380$cm^2$$
• D. $343$cm^2$$

Answer 1

Answer:

$441$cm^2$$

Given:

Diagonal of square is 21√2 cm

Formula used:

For square of side ‘a’, diagonal = √2 $\times$ a

Area of square = a²

Calculation:

√2 $\times$ a = 21√2 cm

⇒ a = 21 cm

∴ Area of square = a²= $21\times{21}$ = 441 cm²