radius = 7

rate = 20

Total Surface Area of HemiSphere formula = sq.units

Total Surface Area of HemiSphere formula = 3 * (22/7) * 7 * 7 sq.units

total surface area = 462

Total Surface Area of HemiSphere = 462 sq.units

Total Surface Area of HemiSphere = 462 sq.units

Cost of painting 1 sq.m = 20

Cost of painting 462 sq.m = 20 * 462

A hemisphere is a half of a sphere.

where,

d = diameter

A = area

C = circumference

r = radius