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A test question we can't solve asks:
The surface area of a sphere is 86pi ft^2. What is the diameter of the sphere?
My daughter is solving by using the formula: SA= 4pir^2 to get the radius. She comes up with 4.64 and plugs that in to: pi x diameter = 2pi x radius. Her final answer is diameter = 9.28ft.
What is she doing wrong?[/quote][/code]
The surface area of a sphere is 86pi ft^2. What is the diameter of the sphere?
My daughter is solving by using the formula: SA= 4pir^2 to get the radius. She comes up with 4.64 and plugs that in to: pi x diameter = 2pi x radius. Her final answer is diameter = 9.28ft.
What is she doing wrong?[/quote][/code]