Question

Express answers in simplest exact form.

What is the area of a sector with radius 10" and measure of arc equal to 45°?

HELP

Answer 1

use this formula: 1/2*r*S
where r is the radius and S is r*phi where phi is equal to 45 deg...

Answer 2

45 deg must be expressed in radians btw. :)

Answer 3

radius 10"
area=100pi sq in
arc=45°
x:100pi=45:360
x=(100pi*45)/360=(25 pi)/2=39.27 sq inch