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chubhunter [2.5K]
3 years ago
10

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

Mathematics
2 answers:
Svetradugi [14.3K]3 years ago
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\pir, where C=circumference and r=radius. Then plug in your numbers. 
C=2\pi4.5=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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