the perimeter of a sector of a circle of area 25π sq. cm , is 20cm. Find the area of sector.
Harprit84:
what is the angle of this sector
not needed to solve the problem
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Area of the circle= 2*pi*r= 25*pi
r=25/2 cm
Perimeter of the sector = 2*l/r=20
2*l/(25/2)=20
l=125cm
Area = r*l*/2
(25/2*125)/2=3125/4=781.25cm ^2
r=25/2 cm
Perimeter of the sector = 2*l/r=20
2*l/(25/2)=20
l=125cm
Area = r*l*/2
(25/2*125)/2=3125/4=781.25cm ^2
in the above
Perimeter = 2l +r
so ans will change
sorry for the rong formula
no problem
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