In figure below, R is the midpoint of NP. If the circumference of circle N is 75.36, what is the area of circle P?
Hello,
the circumference of circle N is calculated by
Now the radius of circle P is:
Now plug in this term into the formula to calculate the circumference:
That means the circumference of circle P is half as long as the circumference of circle N.
EDIT:
Thus r = 75.36 / 2 = 37.68.
The area of a circle is calculated by:
Plug in the value for r into this formula and you'll get: