Question

a cone hemisphere and a cylinder stand on the same base and have equal height find the ratio of their curved surface area

Answer 1

given,
cone,hemisphere and cylinder have same base and equal height.

curved surface area of cone=πrl
curved surface area of cylinder=2πrh
curved surface area of hemisphere=2πr²

ratio=CSA of cone: CSA of hemisphere:CSA of cylinder
=πrl:2πrh:2πr²
=l:2h:2r


HOPE U CAN UNDERSTAND

Answer 2

as they stand on the same base,their radius is also same
height is also same.

csa of cone = pi *rl
csa of cylinder = 2 pi rh
csa of hemisphere = 2 pi r^2
so thier ratio will be,
pi rl : 2pi r h : 2pir^2

pi, r gets cancelled

l : 2h :2r

hope it helps!!!!