The area of a circle is 81π cm ^2 What is the circumference, in centimeters? Express your answer in terms of π.

18π cm

Step-by-step explanation:

The area of a circle is πr²

The circumference of a circle is 2πr

πr² = 81π

or, r² = 81

or, r = √(81)

or, r = ±9

But r=—9 is not acceptable .

so, r = 9 cm

Circumference of the circle is

2πr

= 2π * 9cm

= 18π cm

Answer 18π cm

step-by-step explanation:

one day the were 5 ducks, and their king told them to multiply their kingdom. so each went their own seperate way and met 4 other ducks on their journey.

when the ducks returned to their kingdom, it was discovered that there were 5 groups of 5 ducks. when the kind counted the number of ducks in total (including the ones he sent out earlier) he counted 25.

therefore 5 times 5 is 25.

the end. : )

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step-by-step explanation:

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