Question

Find the area of circle whose circumference is 66 cm​

Answer 1

Answer:

Circumferences of circle=2Πr

66=2×22/7×r

r=66×7/2×22

r=21/2

Now, area of circle=Πr^2

22/7×21/2×21/2

area of circle is 693/2 or 346.5cm square.

Answer 2

$\huge\bold{Answer:}$

Circumference of the circle = 66 cm

2πr = 66

→ 2 × $\frac{22}{7}$ × r = 66

→ r = 66 × $\frac{7}{44}$

→ r = $\frac{21}{2}$

→ r = 10.5

Area of a circle = πr²

The value of r is 10.5 cm

= $\frac{22}{7}$ × 10.5 cm²

= 3.465 cm²

So,

The area of the circle is 3.465 cm²