the area of a sector PQR is a @rad.and the radius of the of the circle is rcm,the area of the sector is 20cm^2 and the perimeter is 26cm.find r?

Answer 1

If the angle is x radians,

1/2 r^2 x = 20
2r + rx = 26

now just solve for r and x.

Answer 2

r= 10.5 , 2.5