Question

find the area of a circle with a diameter of 20 inches

Answer 1

Given,
Diameter = 20inch
Radius = 10inch

Area of circle = πr² = π(10)² = 100(3.14) = 314inch²

Answer 2

Area of circle =πr² [formula used here]
_____________________________

Solution :-

Diameter of circle =2* radius of circle

20=2*radius of circle

20/2 = radius of circle

10 inches = radius of the given circle.
_______________

Then, [ applying formula]

Area of circle =π*10*10

Area of circle =(22*100)/7 [π =22/7]

Area of circle = 2200/7

Area of circle =314.29 inch² [approx. Value]
____________

Area of circle =πr²

Area of circle =3.14*10*10 [π =3.14]

Area of circle = 314 inch²

I hope this will help you

-by ABHAY