A circular fountain at a park has a radius of 4ft. The mayor wants to build a fountain that is quadruple the size of the current fountain . Find the length of the radius of a new fountain?
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Its radius is: 8/2 = 4ft
The area is 9.2376 square feet.
The area increases as the square of the radius (or diameter). So if you double the radius you * 4 (quadruple) the area. Treble the radius, you *9 the area.
The surface area is 377ft2
The answer depends on whether the 4 foot measure is the radius or the circumference.