Surface area = 4*pi*radius2 = 50.265 square feet correct to 3 dp
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It is: 4*pi*11.5squared = 529*pi square feet
a. 2 to 5.
The surface area of a sphere is (4 pi) x (radius of the sphere)-squared.We're not completely sure of what a "90' sphere" is. If you're saying that thesphere's diameter is 90-ft, then its radius is 45-ft, and its surface area is(4 pi) x (45-ft)-squared = 25,446.9 square feet, or 2,827.4 square yards. (both rounded)
The surface area is 2,124 square feet.
The surface area is 2,123.7 ft2