Mensuration >> Hemisphere

Painting cost of hemisphere - Hemisphere - Mensuration problem solver

The surface of a solid hemisphere with its circular base is to be painted. If the radius of the hemisphere is 7 m, find the cost of painting it at the rate of Rs. 20 per sq.m. (hint: find total surface area)

painting cost of hemisphere

radius = 7
rate = 20
Total Surface Area of HemiSphere formula = 3 * Pi * r^2 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 3 * Pi * r^2 = 462 sq.units

Cost of painting 1 sq.m = 20
Cost of painting 462 sq.m = 20 * 462
Cost of painting = 9240

Hemisphere :

A hemisphere is a half of a sphere.

Hemisphere Formulas :

A =  PI * r * r

C =  2 * PI * r

d =  r * 2

r =  C / ( 2 * PI )


where,

d = diameter
A = area
C = circumference
r = radius

Not the question you are looking for ?

Ask Your Question Here