Question

Find the area of circle whose circumference is $220cm$

• A. 3850
• B. 3500
• C. 3700
• D. 3900

Answer 1

The correct option is A 3850

Circumference of circle $=220cm$ [ Given ]

Circumference of circle $=2\pi r$

$\Rightarrow$ $220=2\times \frac{22}{7}\times r$

$\Rightarrow$ $r=220\times \frac{7}{22}\times \frac{1}{2}$

$\Rightarrow$ $r=5\times 7$

$\therefore$ $r=35c{m}^2$

$\Rightarrow$ Area of circle $=\pi r^2$

$=\frac{22}{7}\times 35\times 35$

$=22\times 5\times 35$

$=3850c{m}^2$