Question

find the area of the space enclosed by two concentric circle of radii 25cm and 17cm

Answer 1

area of the circle πr^2

πR^2+πr^2
3.14*25*25+3.14*17*17
3.14*625+907.46
1962.5+907.46
2869.96


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Answer 2

Area enclosed by two concentric circles = π*(25-17)*(25+17) = π*8*42 = 1055.5757316