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3 years ago

A Circle has a diameter of 9 cm. Find the Circumference. Give a Simplified Exact answer. Enter pi with answer. For example 4pi

2 answers:

8 0

First, find the radius of the circle.
-The radius of a circle is half the length of the diameter. If r=radius and d=diameter it would be r=d/2. The radius of the circle is r=9/2=4.5. So the radius of the circle is 4.5 cm.

Second, use the circumference equation of a circle to find the circumference.
The equation is C=2 $\pi$ r, where C=circumference and r=radius. Then plug in your numbers.
C=2 $\pi$ 4.5=9 $\pi$

So the answer is 9 $\pi$ cm.

lutik1710 [3]3 years ago

3 0

Circumference = Diameter * $\pi$

So 9 $\pi$ is the answer

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Step-by-step explanation:

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