If in the figure below, angle XYZ=90° and the length of the arc XZ=10π, then the area of the sector XYZ is:
Explanation:
Y is the centre of the circle.
Let r be the radius of the circle.
∴ Length of arc XZ = 14(2πr)=10π
∴ r = 20
Arc of sector XYZ = 14(πr2)=100π
Hence, option (c).
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