# The radius of a circle is 6.5. What is the diameter circumference and area?

See solution below
Diameter:
The diameter is always double the length of the radius.
Assuming d represents diameter:
d = 6.5(2)
d = 13
The diameter of the circle measures 13.
Circumference
The formula for circumference of a circle is d where d is diameter and is pi.
Now that we know the length of the diameter we can find the circumference or distance around the circle.
Assuming that C represents circumference
C = d
C = 13
C = 13 or 40.84
The circumference measures 13 (exact value) or 40.84 (rounded to the nearest hundredth).
Area
The formula for area is A = ##r^2##. The radius measures 6.5 so we have enough information to solve for A
A = ##r^2##
A = ##6.5^2##
A = 42.25 or 132.73
The area is 42.25 ##units^2## or 132.73 ##units^2##
Hopefully you understand some of the characteristics of circles now!

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