Answer to Question #241406 in Civil and Environmental Engineering for Mr. Lee

Question #241406

A point source of light is 6 ft. from the center of a sphere with a radius of 3 ft. Find surface area that is brightened.

Expert's answer

"S.A=4\u03c0r^2\\\\\n3^2=9\\\\\n=4\\cdot \\:9\\pi \\\\\n=36\\pi"

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