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Q: How do I quadruple radius of 4ft?

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Its radius is: 8/2 = 4ft

25.12ft

The volume is Base x height; the Base area is the same as the formula for a circle - which is proportional to the square of the radius. For example, if you double the radius (or the diameter, or the circumference) of a circle, its area will quadruple.

Radius

Quadrupling the base radius will do that.

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 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 of this cylinder is 376.99ft2

The answer depends on whether the 4 foot measure is the radius or the circumference.

The surface area is 377ft2

Circumference=2Ï€r=2 xÏ€ x4â‰ˆ25.13

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