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The area of sector of circle of radius 5cm is 5ЁЭЬЛ cm2. Find the angle contained by the sector.
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Area of sector = 5ЁЭЬЛ cm2.
Radius (r) = 5cm
Let ЁЭЬГ = angle subtended at centre area of sector =`theta/360^@× pir^2`
=`theta/360× pi × 5 × 5 =(5pitheta)/72^@`
=`(5pitheta)/72^@`= 5ЁЭЬЛ
⇒ ЁЭЬГ = 72°
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