Thread: Sector Angle

Sector of a circle:
Perimeter 115.1 cm
radius 25.4 cm

Calculate the angle:

I get 259, but the answer says 145.

I used this formula:

Sector Perimieter = theta/ 360 * 2*pi*r

Help!

You want the arc length.
But you are given the perimeter of the sector.
That includes the radius twice; substract 2r.