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What is the circumference if the diameter is 13cm

 Mar 16, 2019
 #1
avatar+428 
-5

You can multiply the diamter by 3.14

 Mar 16, 2019
 #2
avatar+219 
-5

Well to find circumference on a circle you must use the following formula:

C = 2 * 3.14 * r

So you understand the formula here is what each one means

r = radius

3.14 = pi 

 

Now you can solve:

Diameter = r*2

so you have a part of the equation

13 = 2 * r

So all you have to do is multiply by pi or 3.14

13 * 3.14 = 40.82

 

If you did it by radius the equation would be:

2 * 3.14 * 6.5 = 40.82

 

But would still have the same answer

 

Hope this helps ;P

 Mar 16, 2019
 #3
avatar+8336 
0

\(\text{Circumference} = \pi (\text{Diameter})\\ \text{Circumference} = 13\pi \text{ cm}\)

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 Mar 17, 2019

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