A hemisphere placed over square prim and A cone over a square block

15. A hemisphere of diameter 50mm is centrally resting on top of a square prism of base side 60mm and height 30mm such that the curved surface of the hemisphere is touching the top face of the prism. Draw the isometric projections.
17. A cone of base diameter 50mm and height 40mm is placed centrally on top face of a square slab side-80mm and height 20mm. Draw the isometric projection of the combination.