Question

Find the area of a circle whose circumference is 31.4 units

Answer 1

Circumference = 2 x Pi x Radius (R)
Pi = approximately 3.14

-> 31.4 = 2 x 3.14 x R
-> R x 6.28 = 31.4
-> R = 31.4/6.28
-> R = 5 units

Area = Pi x R^2

-> Area = 3.14 x 5^2
-> Area = 3.14 x 25
-> Area = 78.5 Units^2

Answer 2

Answer:

The area of the circle is 78.5 unit square.

Step-by-step explanation:

Given : The circumference is 31.4 units.

To find : The area of the circle ?

Solution :

The circumference of the circle is $C=2\pi r$

Where, r is the radius

C is the circumference C=31.4 units

$31.4=2\pi r$

$r=\frac{31.4}{2\times 3.14}$

$r=5$

The radius of the circle is r=5 unit.

The area of the circle is $A=\pi r^2$

$A=3.14\times 5^2$

$A=3.14\times 25$

$A=78.5$

Therefore, The area of the circle is 78.5 unit square.