Suppose a slice of a 10-inch pizza has an area of 15 square inches. what is the angle of this slice?

Angleslice/360 times area=area of slice

area=pir^2
normally pizzas are given in terms of ther diameter
so 10=diameter
d/2=r, 10/2=5
r=5
area=pi5^2=25pi

angleslize/360 times 25pi=15
do math
times 360 both sides and divide by 25pi both sides
angle=68.7549 degrees or 1.2 radians