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You need to work backwards. the formula for area is r^2pi=A. to find the radius, r, you divide the diameter in half. therefore (d/2)^2pi=Area. plug in your #'s an solve.
Ex. Area=16pi Find diameter.
(d/2)^2pi=16pi divide both sides by pi
(d/2)^2= 16 take the square root of both sides
d/2=4 multiply both sides by 2
d=8
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How do you find the radius and diameter of the circle if you know the area?
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)
How do you find the area of a circle using its diameter?
The area of a circle is pi(radius)2 Radius is half the diameter. Simply divide the diameter in half and enter it into the equation 3.14(diameter/2)2
Find the surface area of a sphere with a diameter of 78 use 3.14 for pi?
The surface area of a sphere with diameter 78 and using 3.14 for Pi is about 19,103.76 units2
How do you find the volume of a cylinder from a given diameter and height?
Easy, you find the area of the circle (Pi X Radius squared) and then multiply it by the height. Your question asks about using the diameter...the radius is half of the diameter.
How do you find the diameter if I have the area?
If the area of a circle is known, the radius can be determined using the area formula: A =π r2, (r = radius, π = to 3.14)A/π = r2,√(A/π) [divide the Area by π, then find the square root of the result ] = r,Then, find the diameter (twice the radius): d = 2r.
