what is the formula to work out the circumference of a circle?
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The circumference = π x the diameter of the circle (Pi multiplied by the diameter of the circle). Simply divide the circumference by π and you will have the length of the diameter. The diameter is just the radius times two, so divide the diameter by two and you will have the radius of the circle!
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Understanding the Area and Circumference of a Circle. Factoid: The area of a circle is pi (approximately 3.14) times the radius of the circle squared. The circumference is pi times the diameter.
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Use the formula C/2π. Since the circumference is equal to πD, which is equal to 2πr, dividing the circumference by 2π will give the radius. If you have a sphere with a circumference of 20 m, find the radius by dividing 20/2π = 3.183 m. Use the same formula to convert between the radius and circumference of a circle.
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To work out the area of a semicircle you can use the formula A = (Pi*r^2)/2. This is because the area of a full circle is A = Pi*r^2 and a semicircle is half the area of a full circle so you divide this by 2.
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84.74 cm. The circumference of a circle if the area is 300 square centimeters. Area = pi*r^2 = 3.14*r^2 , area = 300 , r^2 = 300/3.14 = 95.5414 , r = 9.77cm , circumference =2 *pi*r =2*3.14*9.77 = 61.38 cm.
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The Circumference of a circle or a sphere is equal to 6.2832 times the Radius. The Circumference of a circle or a sphere is equal to 3.1416 times the Diameter.
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Correct. If the radius is 8 inches, the correct formula for circumference when the radius is given is The correct answer is 50 inches.
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The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.
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We've learned that the circumference is the distance around the circle and the diameter is the distance across the circle going through the center. Both are parts of a circle. The circumference formula, C = pi*d, tells you how the circumference and diameter are related.
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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.
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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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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. So, C = 2πr.
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Answer and Explanation: The diameter of a circle is D=10 inches D = 10 inches . Therefore, the radius of the circle is 5 inches . Therefore, the circumference of the circle is approximately 31.41 inches .
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In the case of a circle, the formula for area, A, is A = pi * r^2, where r is the circle's radius. Since we know that a semicircle is half of a circle, we can simply divide that equation by two to calculate the area of a semicircle. So, the formula for the area of a semicircle is A = pi * r^2/2.
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Students learn that the circumference of a circle is the distance around the circle, and the formula for the circumference of a circle is 2 times pi times the radius of the circle. Pi is the ratio of the circumference to the radius, which is approximately 22/7 or 3.14.
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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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To calculate the circumference of a circle, multiply the diameter of the circle with π (pi). The circumference can also be calculated by multiplying 2×radius with pi (π=3.14).