The tsa of a solid right circular cylinder is 231cm². Its csa is 2/3 if the tsa. Find the radius and height of the cylinder. bhai dedo answer
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The total area of cylinder = 2πrh+2πr^2
curved surface area = 2πrh
2/3 * (2πrh +2πr^2) = 2πrh
2πr (2/3*h+r) =2πrh
2/3 * (h+r) =h
2h+ 2r = 3h
h =2r
so,
2πrh +2πr^2 = 231
2πr(h+r) =231
2πr *3r =231
r=3.5cm
and, h =2r
so height = 7cm
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