Imagine slicing through a sphere with a plane (sheet of paper). the smaller piece produced is called a spherical cap. its volume is v= πh2(3r−h) /3, where r is the radius of the sphere and h is the thickness of the cap. find dr/dh for a spherical cap with a volume of 5π/ 3 m3. evaluate this derivative when r=2 m and h=1 m. what is the expression for dr /dh? and evaluate this derivative when r= 2m and h = 1m.