sector of two concentric circle of radius 7 cm and 3.5 CM are given find the area of shaded region
vishalgajranideepak:
but the figure
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Answer:shaded portion area = area of sector ADE -area of sector ABC
=∅÷360 pi R2 - ∅÷360 pi r2
= ∅÷360 pi [ R2-r2]
= 30/360 *22/7 [49-12.25]
= 1/12 * 22/7 [36.75]
=11/42 * 36.75
= 11/6 * 5.25
= 57.75/6
= 9.625 cm2
Step-by-step explanation:
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