There are 3 slices of pie left, and the angle measurement is 72 degrees, how many slices was the pie cut in to

15; this is because 3 pies make up 72

with this you can make it so that 3x=72

After this you need to find x which is a single pie

so; (3x/3) = (72/3)

x = 24

Since you know a circle is 360 degrees all around the center

You can do 360/24 making it 15 pies.