What is The circumference of a circle whose area is 81 π r 2?
Please answer with explanation.
Answers
Answered by
1
Answer:
Let us assume R be the radius of circle
We know that,
area of circle = πR2
81πr2 = πR2
R = √81 r
R = 9r
Circumference = 2 πr
= 2 π (9r)
= 18πr
Similar questions