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the area of shaded region between two concentric circles is 286cm2 . if the diffrence of the radii of the two circles is 7cm, find the sum of their radii ............ plzz reply

Let the inner radii be r and outer radii be R.

Area of two concentric circles is 286 sq cm.

Area of concentric circles = π(R2-r2) = 286Difference in radii = R - r = 7 cmπ(R - r) ( R + r) = 286227×7×(R + r) = 286R + r = 28622 = 13 cm

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