Question 573020: Calculate the circumference and area of each circle
16cm
20cm
10cm
8cm
18cm
Answer by mathsmiles(68)   (Show Source):
You can put this solution on YOUR website! You have to be more specific with what 16cm, 20cm, etc are. Are those radii or diameters?
The formula for circumference is
C = pi x diameter
The formula for area of a circle is
A = pi x radius^2
Finally,
diameter = radius x 2
With those three formulas, you should be able to solve this for each of the lengths you mention, being careful to convert radius and diameter.
Good luck!!
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