Question

find the diameter of a circle whose area is 38.5

Answer 1

Hey Buddy..
Here is your answer..

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Area of circle = 38.5
πr² = 38.5
22/7 × r² = 38.5
r² = 38.5 × 7/22
r = √12.25
radius = 3.5

So, Diameter = radius × 2
= 3.5 × 2 = 7

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I hope my answer helps you ..
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Answer 2

Given,area of circle =38.5 units²

we know,

area of circle =πr²

28.5 =3.14r²

r² =12.26

r = 3.50

diameter =2×radius = 7 units