looks like you've written the clues in question yourself.. according to the question (we let r be the radius and h be the height of the cylinder) 4*2πr(squared)=2πrh 4r=h r=28/4 r=7 so the radius is 7cm which means the radius of the hemisphere is 7cm and the height of the hemisphere is also 7cm so the total height is 28+7=35 Ans!
