what is the diameter of a circle whose area is equal to the sum?
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Answer: Diameter is 82 cm. The area of a circle is equal to the sum of the areas of two circles of radii 40 cm and 9cm. It means the radius of big circle is 41 cm and diameter is 82 cm.
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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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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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the formula for circumference of a circle is 2 x pi x r(radius).
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Hence the total surface area of the hemisphere = 3(pi)R^2. A semicircle has a straight line equal to the diameter of the circle and a curved line. The straight line is of length 2R and the curved line (pi)R. Hence the total perimeter of the semicircle = 2R + (pi)R.
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The area of a circle is equal to the square of its radius times pi. The circumference of a circle is equal to the diameter times pi. ... So when you double the radius, the area goes up by 4 times because 2 squared is 4. The area will always go up by the square of how much the radius goes up.
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Pi is sometimes given the value 22 over 7 which is approximately 3.14. For a more accurate approximation, you should have a pi button on your calculator. The formula for area equals pi times the radius squared, R stands for the radius measurement of the circle. So the formula is area equals pi R squared.
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If the diameter of the circle is 12", then the radius is 6" (half the diameter), and the area "A" is (approximately) 3.14 * 6^2 or about 113.04 sq.
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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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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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Circumference of a circle is given by 2πr. Therefore 2πr is equal to 22…. Now considering π is equal to 22/7….. Now diameter is 2 times the radius…so the diameter is 7 cm…
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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). Originally Answered: What is the difference between circumference and the area of a circle?
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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. so the area is about 78.5 square feet.
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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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So a diameter is the same as two opposing radii. The formula for the area of a circle is A = π r2, where r is the length of the radius of a circle. We can use our knowledge that a diameter is made up of two radii to understand that r = d/2.
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The diameter, like in a normal circle, is just twice the radius. If given the perimeter: The perimeter of a semicircle will be one half the circumference of its original circle, πd , plus its diameter d .
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Answers. 1. The formula for the area A as a function of the diameter d of a circle is given by A = π (d/2)^2.