how to find diameter if i have circumference?
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Solve the equation for the diameter of the circle, d= C/π. In this example, "d = 12 / 3.14." or "The diameter is equal to twelve divided by 3.14." Divide the circumference by pi to get the answer. In this case, the diameter would be 3.82 inches.
754438
If the object is a circle, and you know its circumference, you would divide the circumference by pi to find the diameter of the circle. Half the diameter is the radius. Square the radius and multiply by pi to find the area of the circle.
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["If you have any two points [let,(a1,b1)&(a2,b2)] on circle's diameter,expect the two points on circumference you should find the equation of diameter with-", '(x-a1)*(a1-a2)=(y-b1)*(b1-b2)', 'and then there will be two equations -', '(1)E. of circle : (x-h)^2+(y-k)^2=r^2 [let]', '(2)E. of diameter : ax+by+c=0 [let]', 'find the (x,y).']
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It is calculated by multiplying the distance across the center (diameter) by Pi (3.1416). If I know the radius of a circle, how I can find the circumference? Double the radius to get the diameter. Then multiply by pi to get the circumference.
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['Cut a string that is about 6 inches long.', 'Fold the string around the base of the finger, just below the knuckle.', 'Mark where the string ends with the pen.', 'Place the measured string on the ruler with the area marked on your right.', 'The number closest to the pen mark is the circumference of the ring in millimeters.']
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Write down the formula for calculating the circumference of a circle; C = πd, where C = circumference, π = 3.14 and d = diameter. Say aloud the meaning of the formula's symbols to make sure you understand, saying "Circumference equals pi times the diameter of a circle."
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Fold the thin strip of paper around the finger at the base and close enough to your knuckle. Mark the area where the two ends of the paper strip meet. Use the ruler to measure the length in millimeters to give you the circumference. Convert the measurement to the appropriate ring size, using the ring size chart above.
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Solve the equation for the diameter of the circle, d= C/π. In this example, "d = 12 / 3.14." or "The diameter is equal to twelve divided by 3.14." Divide the circumference by pi to get the answer.
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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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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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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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Cut a thin strip of paper about 100 millimeters long. Fold the thin strip of paper around the finger at the base and close enough to your knuckle. Mark the area where the two ends of the paper strip meet. Use the ruler to measure the length in millimeters to give you the circumference.
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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 circumference is the total length around the circle. It's equal to (pi x diameter) OR (2 x pi x radius). The area of the circle is the surface area enclosed by the circle, which is equal to pi x (radius ^ 2).
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You can also work out the circumference of a circle if you know its radius. Remember that the diameter is double the length of the radius. We already know that C = πd. If r is the radius of the circle, then d = 2r.
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2 pi r is the way to find the circumference when you have the radius. Comment on Aydia C's post “2 pi r is the way to find the circumference when y...”
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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.