Question

the circumference of a circle whose area is 81πr square is _​

Answer 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) = 18πrRead more on Sarthaks.com - https://www.sarthaks.com/840950/the-circumference-of-a-circle-whose-area-is-81r-2-is-a-9r-b-18r-c-3r-d-81r

Step-by-step explanation:

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Answer 2

Answer:

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) = 18πrRead more on Sarthaks.com - https://www.sarthaks.com/840950/the-circumference-of-a-circle-whose-area-is-81r-2-is-a-9r-b-18r-c-3r-d-81r

Step-by-step explanation:

it is answer. please mark me as brainlist