find the area enclosed between two concentric circle of radius 3.5 cm and 7cm. A third concentric circle is is drawn outside the circle of 7cm so that the area enclosed between it and the 7 cm circle is the same as that between the two inner circle. find the radius of the third circle correct to one decimal place
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Answer:
Given,1st circle radius =3.5 cm(r), another circle radius= 7 cm
(R)
Formula to find the area of a circle =πr^2
Greater circle area - Smaller circle area = Area between the two circle
=πR^2-πr^2 (π= 22/7)
=22/7 x (7)^2- 22/7 x (3.5)^2
=22/7 x 14 - 22/7 x 7
=22 x 2 - 22
=44 - 22
= 22 cm
deepak2622:
Bhai ans decimal me lana tha
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