# Mensuration-9

### From Homeworkwiki

**A memorial is in the form of a cylinder surmounted by a hemisphere. The diameter of**

**the sphere is 20 m and the total height of the memorial is 28 m. Find the surface area.**

**Solution:** The curved surface area of the cylindrical portion = 2 π r h

= 2 x 22/7 x 10 x 28 sq. m

= 1760 sq. m

The surface area of the hemisphere = 2 π r^{2}

= 2 x 22/7 x 10 x 10

= 4400/7 sq. m

The surface area of the memorial = 1760 + 4400/7 = 2388-4/7 sq. m