Question

If perimeter and length of a rectangle are 70 cm and 20 cm respectively, then area of the rectangle will be .

• A. $300c{m}^2$
• B. $350c{m}^2$
• C. $200c{m}^2$
• D. $400c{m}^2$

Answer 1

The correct option is A $300c{m}^2$

$Given:l=20cm$
$Perimeter=2\times (l+b)$
$70=2\times (20+b)$
$(20+b)=35cm$
$b=(35-20)cm=15cm$

$Areaofrectangle=l\times b$
$l\times b=(20\times 15)c{m}^2$
$Area=300c{m}^2$