Question

The perimeter of the sector is 124m. If sector angle of 36 degrees, then the radius is:

Answer 1

I know the formula is \[2 \pi r + 2r\] can't seem to solve it though

Answer 2

i know a formula is
theta=s/r

Answer 3

theta is in radian unit

Answer 4

If you mean, the length of the total sector, not only the curve part, then the formula cannot be 2 pi r+ 2r, because the angle is not 2 pi. You can correct the formula,
\[\theta r+2r=124\] with theta in radians,
\[\theta=36\pi/180\] And then solve for r.