How many coins of diameter 1.5 cm and of thickness 0.2 cm can be made by melting a metal right circular cylinder of diameter 4.5 cm and height 10 cm ?

How many coins of diameter 1.5 cm and thickness 0.2 cm can be made by melting a right circular metallic solid cylinder of height 10 cm and diameter 4.5cm?

If n coins each of diameter 1.5 cm and thickness 0.2 cm are melted and a right circular cylinder of height 10 cm and diameter 5 cm is made, then n is equal to

How many sphere 12 cm in diameter can be made from a metallic cylinder of diameter 8 cm and height 90 cm ?

Find the curved surface area (in cm^(2) ) of a right circular cylinder of diameter 21 cm and height 10 cm.

Find the total surface area (in cm^(2) ) of a right circular cylinder of diameter 21 cm and height 10 cm.