Question 632464
Hester needs 14 square feet of material to make an inflatable ball. How much material to the whole foot would she need to make a ball with twice the diameter of the original?
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surface area of a sphere=4πr^2
this means surface area of a sphere is proportional to the square of the radius
twice the diameter=twice the radius
material new ball will need=2^2*14=4*14=56 sq ft