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A circle with a radius of 63 cm has an area of 12,468.98 square cm.
radius=13 area=40.82 circumfrence=8.28025477707
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.
Area = (pi) x (Radius)2 (Radius)2 = Area/pi Radius = sqrt(Area/pi) Diameter = 2 x radius = 2 x sqrt(Area/pi)
Volume = 4/3 * pi * radius * radius * radius Surface Area = 4 * pi * radius * radius