Find the ring formed by two concentric circles of radius $14 c m, 7 c m$

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Solution

Area of ring is given by $π (R^{2} - r^{2}) \frac{2}{7} \times (14^{2} - 7^{2}) \frac{22}{7} \times (196 - 49) \frac{22}{7} \times 147 22 \times 21 = 462 c m^{2}$

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Find the ring formed by two concentric circles of radius 14cm,7cm

Area of ring is given by π(R2−r2)27×(142−72)227×(196−49)227×14722×21=462cm2

Find the ring formed by two concentric circles of radius $14 c m, 7 c m$

Area of ring is given by $π (R^{2} - r^{2}) \frac{2}{7} \times (14^{2} - 7^{2}) \frac{22}{7} \times (196 - 49) \frac{22}{7} \times 147 22 \times 21 = 462 c m^{2}$