Find the area of the shaded region of two concentric circles with radius 15 centimetres and radius 20 cm
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shaded area = πR^2 - πr^2 = π(R^2-r^2)
= 22/7(20+15)(20-15)
= 22/7(35)(5)
= 3,850/7
= 550 cm^2
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550 cm^2 is your answer
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