[" 4.A cubicälblock of side "7cm" is surmounted by a hemisphere.What is the greatest diameter the "],[" hemisphere can have? Find the surface area of the solid."],[" 5.A hemispherical depression is cut out from one face of a cubical wooden block,such that the "],[" diameter "1" of the hemisphere is equal to the edge of the cube.Determine the surface area "],[" the remaining solid."]