so, to find the measure of an src length we use the formula
angle / 360 * 2 pi r
so, if we plug it in, it is
85 / 360 * 2 pi 4
that equals 17 pi / 9 ft^2
that is the arc length.
to find the perimeter of the sector ( a sector is j the region w the arc) add the two radi as well as the newly found arc length
that should be 4 + 4 + 17 pi / 9
this equals roughly 13.9341 ft^2
