what is the formula for calculating the radius?
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The two formulas that are useful for finding the radius of a circle are C=2*pi*r and A=pi*r^2. We use algebra skills in solving for our variable r. We know that the constant pi is always 3.14. Another word related to the radius is diameter, which is always twice the radius.
802984
r is the radius of the cylinder and h is its height. So for example, let's say you had a cylinder that had a radius of 3 cm and a height of 6 cm. For surface area, you would calculate: 2π(3)(6)+2π(3)2 , which will give you 54π .
302197
Just remember to divide the diameter by two to get the radius. If you were asked to find the radius instead of the diameter, you would simply divide 7 feet by 2 because the radius is one-half the measure of the diameter.
110502
The radius varies with the height and volume. V = (1/3)π(r^2)h. r=√(3V/πh) will give you the radius at the base of the cone.
1283695
The Radius is the distance from the center outwards. The Diameter goes straight across the circle, through the center. The Circumference is the distance once around the circle.
535467
Well, to get the radius from the circumference of a circle, you would divide it by 2 pi. pi and pi cancel out and we have... If we were to find diameter from a circumference, we only need to divide by pi since 2*r = diameter. hope this helps!
885108
Know the parts of the equation, Surface Area = 4πr2. Using almost any calculator, you can plug in the radius to get the surface area of your sphere. r, or "radius: The radius is the distance from the center of the sphere to the edge of that sphere.
847077
Calculate the volume according to the formula pi times the radius squared times the height (v = ? x r2 x h). For example, a cylinder with a radius of three centimeters and a height of five centimeters would have a volume of 141 cubic centimeters (? x 3 cm x 3 cm x 5 cm = 141 cm3).
1463793
Find formulas for the circle's radius, diameter, circumference and area , in terms of 'a'. As we've shown above, the circle's radius is equal to the half the length of the square's side, so r=a/2. The diameter is twice the radius, so d=a. The circumference is d ·π, so C=πa.
72495
Well, to get the radius from the circumference of a circle, you would divide it by 2 pi. pi and pi cancel out and we have... If we were to find diameter from a circumference, we only need to divide by pi since 2*r = diameter.
508632
The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. Substitute 8 for r and 15 for h in the formula V=πr2h .
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Using the Radius First, double the radius to get the diameter (radius x 2, or radius + radius). One you have the diameter, you can use the equation C = πd.
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Calculating Diameter From the Radius The radius is the length from the center of a circle to the edge. Therefore, if you know the radius, multiply it by two to determine the diameter (diameter = 2 x radius).
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Use “D = R x 2”, in which "D" equals diameter and "R" equals radius, to solve for the diameter using the numbers you got earlier. Then use “C = pi x D”, in which "C" equals circumference, to solve for the circumference.
1060414
First, divide the diameter by 2 and plug the values for volume, pi, and radius into the formula for volume of a cylinder. Next, square the radius and multiply the values together. Then, divide both sides by 200.96 for the answer, remembering to include the appropriate unit of measurement.
1397415
The radius is half the diameter, so use the formula r = D/2. This is identical to the method used for calculating the radius of a circle from its diameter. If you have a sphere with a diameter of 16 cm, find the radius by dividing 16/2 to get 8 cm. If the diameter is 42, then the radius is 21.
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['d=2πr and r=12d.', 'Circumference of a circle (c)=2πr.', 'Area of a circle (A)=πr2.']