What is the radius of the circle if the angle of sector is 90° and the area of the circle is 196 cm2?
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Answer:
Given, radius, r=20 cm, central angle, θ=90•, π=3.14
Area of sector = θ/360°×πr^2
=90°/360°×3.14×20×20
= 1/4x314/100 ×20×20 =314
∴ the area of sector is 314 cm 2 .
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