Question

The area of a circle is $154$ sq. cm. Its circumference is

• A. $22cm$
• B. $35cm$
• C. $44cm$
• D. $28cm$

Answer 1

The correct option is C $44cm$

$\Rightarrow$ area of a circle $=154c{m}^2$

circumference $=2\pi r$

area $=\pi r^2=154$

$\frac{22}{7}\times r^2=154$

$r^2=49$

$r=7$

circumference $=2\times \frac{22}{7}\times 7$

$=44$