Question

Pi 3.14 ,find the diameter of the circles whose areas are 7.065 mm²

Answer 1

Given.

Area of circle= 7.065mm²

since, Area of circle= πr²

therefore,

πr²= 7.065

3.14 × r² = 7.065

r² = 7.065÷3.14

r²= 2.25

r= √2.25

r= 1.5mm

since, Diameter= 2× radius

Diameter = 2× 1.5

= 3.0

= 3 mm