The area of a minor sector of a circle is 3.85 cm2 and the measure of its central angle is 36°. Find the radius of the circle.


Given area of minor sector = 3.85cm2
Measure of central angle, = 36˚
Area of sector = (/360)r2
3.85 = (36/360)×(22/7)×r2
r2 = (3.85×360×7)/(36×22)
r2 = (3.85×10×7)/22
r= 12.25
r = 3.5cm
Hence the radius of the circle is 3.5cm

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