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## Homework Statement

The inner and outer radii of a hollow steel hemispherical vessel are 2 cm and 3 cm respectively.what is the total cost of painting the vessel all over at the rate of 70 cents per cm² ?

[ b]2. Homework Equations [/b]

Curved surface area of hemisphere=2[pi]*[radius]²

## The Attempt at a Solution

total Surface area= 2[pi]*{[inner radius]² + [outer radius]²}

TOTAL cost = 0.7*total Surface area

is it right?