Answer:
ince a slice of pizza is a sector from a circle, where you start cutting from the center, keep in mind that the central angle is also the measure of the intercepted arc. Your intercepted arc/central angle n is 72° and the radius, r is 10 inches, (the radius is half of the diameter).
Then you'll need the arc length for the length of the crust
You'll need the area of a sector for the area of the slice
*Arc Length is found by 2πr (n/360)
The area of a Sector is A =(n/360)πr2
*(Length of arc/Circumference) = (Degree measure of arc/360) this proportion can also be used to calculate Arc Length.
