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How do you find the radius of a circle with the diameter?

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How do you find the radius of a circle with the diameter?

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.

What is the area if the diameter is 12?

To find the area of a circle, you need to use the formula A=π⋅r2 ; therefore the area A is π⋅62≈113 square inches.

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How do you find the circumference of a circle with the area and diameter?

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).

What is 2pi R?

2 pi r is the the circumference of a circle, while pi r squared is the area of a circle. 2 pi r is the circumference of a circle of radius r. Pi r squared is the area of a circle of radius r.

How do you find the radius with the diameter and circumference?

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.

How do you find the area with the circumference?

How to find the area of a circle from the circumference?

  1. Divide the circumference by π.
  2. Divide the result by 2 to get the circle’s radius.
  3. Multiply the radius by itself to get its square.
  4. Multiply the square by π, or 3.14 for an estimation.
  5. You found the circle’s area from the circumference.
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How do you find area with radius?

The area of a circle is pi times the radius squared (A = π r²).

What is the circumference of a 14 circle?

87.9646 cm
Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm .

Is the circumference of a circle the same as the area of a circle?

The area and circumference of a circle can be calculated using the following formulas. Circumference = 2πr ; Area = πr2. The circumference of the circle can be taken as π times the diameter of the circle. And the area of the circle is π times the square of the radius of the circle.

How to find the area of a circle from the circumference?

To find the area of a circle from the circumference, follow these steps: 1 Divide the circumference by π. 2 Divide the result by 2 to get the circle’s radius. 3 Multiply the radius by itself to get its square. 4 Multiply the square by π, or 3.14 for an estimation. 5 You found the circle’s area from the circumference.

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What is the radius of a circle with diameter 12?

A circle of radius = 6 or diameter = 12 or circumference = 37.7 centimeters has an area of: 1.131 × 10 -8 square kilometers (km²) 0.01131 square meters (m²) 113.1 square centimeters (cm²)

How do you find the radius of a circle in cm?

Radius = r = C/2π. Therefore, the radius of the given circle is 3.5 cm. More topics in Radius Formula. Unit Circle Formula. Circle Formula. Diameter Formula. Surface Area of a Sphere Formula.

What is the formula for radius in math?

Formulas for Radius. 1 r is the radius of the circle. 2 d is the diameter of the circle. 3 C is the circumference of the circle. 4 A is the area of the circle.