Question

if the area if a circle is 81πr^2.What is it's circumference?show full work


a)9πr b)18πr
c)3πr
d)81πr

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Answer 1

Step-by-step explanation:

9πr

Hope it helps u mate.........

Answer 2

Answer:

= 18π

Step-by-step explanation:

•given area of a circle is 81πr^2. (π = X)

•we know that the area of a circle is πr^2.

•so, πr^2 = 81π

• r^2 = 81 then r = 9 (9×9=81)

so, as we know that the circumference of circle is

2πr.

so, putting r = 9 circumference will be,

2π9 = π = 2×9= 18π

i.e the circumference of the circle is equals to 18π