exam Maths Puzzle Numerical Ability

I have a sphere that is 5 1/2 feet in diameter. How do I find the approximate square footage of the surface area.

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exam Other Question

Right trianlge ABC has legs with lenghts 19 and 95 units. The triangle is to be rotated in space about one of its three sides. What is the maximum possible volume of the resulting if a+b+c=0 then a^3+b^3+c^3/abc=?