19/05/2008 · Area of a circle =area of rectangle=base x height of the rectangle equals radius of circle base of rectangle equals 1/2 of the circumference of the circle if.

The area of a rectangle is base x height. So if the base is πr and the height is r, the area of the rectangle is πr x r. Another way of writing this is π r², because r x r = r². TIP: π is just over.

If a cylinder has a flat bottom, meaning the height and radius meet at right angles, then this formula can be used to find of volume (‘V’) of that cylinder: V = PI*r 2 h In plain english the volume of a cylinder can be calculated by squaring the radius, multiplying that value by PI.

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The area of the curved space is given by (4 x pi x r2) / 2 = 2 x pi x r2The area of the circle is equal to pi x r2.Hence the area of the half sphere is 3 x pi x r2. The area of acicle is 28 square.

Volume of a cylinder is pi x radius squared x height. where r is the radius of the cylinder and h is the height of the cylinder. Value of pi=3.14 (The pi x r2 is the area of a cross section of the

05/08/2015 · Stacey Newman/E+/Getty Images The phrase "pi r squared" refers to the mathematical formula used to determine the area of a circle. Normally, the equation is written as "pi * r 2," or "Π * r 2.

π = pi = 3.1415926535898 √ = square root Calculator Use. Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. Units: Note that units of length are shown for convenience. They do not affect the calculations. The units are in place to give an indication of the.