MAHARASHTRA Class 10: Combination of Solids Videos | Surface Area: Combination of Solids

Lateral surface area of a cylinder = 2πrh 

Total surface area of the cylinder = 2πr(r + h) 

Curved surface area of a hemisphere = 2πr²

Total surface area of the hemisphere = 3πr²

Ratio of the curved surface area of a hemisphere to its total surface area is 2:3. 

Polyhedrons are 3-dimensional solids whose faces are polygons joint at their edges. Polyhedrons are regular and irregular and do not have curved surfaces.