how to find the radius from diameter?
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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. The radius of the circle is 3.5 feet. You can also use the circumference and radius equation.
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Divide the area of the circle by π, and then calculate the square root to find the radius. For example, the area of the circle is 100 square feet. Dividing by π equals 31.839. The square root of 31.839 is 5.649 feet.
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The d represents the measure of the diameter, and r represents the measure of the radius. The diameter is always twice the radius, so either form of the equation works. This formula reads, “Area equals pi are squared.” Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length.
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Write down the formula for finding the circumference of a circle using the diameter. The formula is simply this: C = πd. In this equation, "C" represents the circumference of the circle, and "d" represents its diameter. That is to say, you can find the circumference of a circle just by multiplying the diameter by pi.
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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.
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If you know the radius of the circle, double it to get the diameter. The radius is the distance from the center of the circle to its edge. If the radius of the circle is 4 cm, then the diameter of the circle is 4 cm x 2, or 8 cm. If you know the circumference of the circle, divide it by π to get the diameter.
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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.']
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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.
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['First, work out the area of one of the circular ends of the cylinder. The area of a circle is πr2 (π × radius × radius). π (pi) is approximately 3.14. ... ', '3.14 x 2.5 x 2.5 = 19.63cm2 The volume is the area of an end multiplied by the length, and is therefore:', '19.63cm2 x 20cm = 392.70cm3']
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multiply. pi times diameter. solve for circumference of a circle.
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The radius of a cone is the radius of its circular base. You can find a radius through its volume and height. Multiply the volume by 3.
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Cylindrical Tanks Another way to find the radius is to divide the diameter, or width, by two. Square the radius by multiplying the radius times itself and then multiply it by 3.1416, which is the constant pi. Multiply this number by the height to determine the cubic volume in inches.
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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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To calculate the diameter of a circle, multiply the radius by 2. If you don't have the radius, divide the circumference of the circle by π to get the diameter. If you don't have the radius or the circumference, divide the area of the circle by π and then find that number's square root to get the radius.
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Finding the Diameter or Radius The circumference of a circle is equal to pi times the diameter. The diameter is two times the radius, so the equation for the circumference of a circle using the radius is two times pi times the radius.
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The radius is half as long as the diameter, so the diameter can be thought of as 2r. Keeping this in mind, you can write down the formula for finding the circumference of a circle given the radius: C = 2πr. In this formula, "r" represents the radius of the circle.