Find the area (in cm2) and the diameter (in cm), respectively, of a circle whose circumference is 40π cm?
Answer & explanation
Correct answer: option 1
We know that,
Circumference of circle =2πr
Area of circle=πr²
Given,
The circumference of the circle is 40 π cm
So,
2πr = 40π
= r = 20
Diameter of circle = 2r = 40cm
Area of circle = π r² = π × (20 × 20) = 400π