Question

The perimeter of sector of a circle of radius 4.5cm is 25cm. Find the area of sector.CLASS 1Oth

Answer 1

perimeter of sector=2r*l
25=2*4.5*l
25=9l
25/9=l
so area of sector=1/2*l*r
                           =1/2*25/9*4.5
                           =12.5/2
                           =6.25cm^2