Question

how do you find the area of a sector on a circle?

Answer 1

you ask someone in the maths section :)

Answer 2

this should help you though;
Notice that when finding the area of a sector, you are actually finding a fractional part of the area of the entire circle. The fraction is determined by the ratio of the central angle of the sector to the "entire central angle" of 360 degrees, or by the ratio of the arc length to the entire circumference.