the cylidrical cap at the top has no given hight? is it really possible to solve this? Or am i missing somthing obvious?
The HEMISPHERICAL cap has a 'height' equal to the radius = 20 cm
Surface area of a sphere = 4 pi r^2 <====== take 1/2 of this because it is a HEMI-sphere
Oh I see! I get it. Thanks!