Question

Find the area of the shaded region of two concentric circles with radius 15 centimetres and radius 20 cm

Answer 1

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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Answer 2

550 cm^2 is your answer