SOLUTION: an earth model has a radius of 24 inches. Since roughly 75% of earths surface is covered by water, he wanted to paint 75%of his model blue. Approximately how many square inches on

Algebra ->  Surface-area -> SOLUTION: an earth model has a radius of 24 inches. Since roughly 75% of earths surface is covered by water, he wanted to paint 75%of his model blue. Approximately how many square inches on       Log On


   

Question 438378: an earth model has a radius of 24 inches. Since roughly 75% of earths surface is covered by water, he wanted to paint 75%of his model blue. Approximately how many square inches on his model will be painted blue
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
The surface area of a sphere = A = 4%28pi%29r%5E2
Given: r = 24 in.
75%, or 3/4 of the surface area A is to be painted blue:
3/4A = 3%28pi%29%2824%29%5E2 = 5428.67 sq. in.