How To Calculate Radius Of Circle

How To Calculate Radius Of Circle

To calculate the radius of a circle, you need to know the circumference of the circle or the diameter of the circle.

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How To Calculate Radius Of Circle from Circumference

To calculate the radius of a circle from its circumference, you can use the formula C = 2 * pi * r, where C is the circumference and r is the radius. Solving for r, we get r = C / (2 * pi).

Circumference: If you know the circumference of the circle, you can use the formula C = 2 * pi * r, where C is the circumference and r is the radius. Solving for r, we get r = C / (2 * pi).

Here’s an example of how to use the formula to calculate the radius of a circle from its circumference:

Let’s say the circumference of the circle is 20 units. To find the radius, use the formula r = C / (2 * pi):

r = 20 / (2 * pi)
r = 20 / (2 * 3.14)
r = 20 / 6.28
r = 3.18

So the radius of the circle is approximately 3.18 units.

How To Calculate Radius Of Circle from Diameter

Diameter: If you know the diameter of the circle, you can use the formula d = 2 * r, where d is the diameter and r is the radius. Solving for r, we get r = d / 2.

Here’s an example of how to use the formula to calculate the radius of a circle from its diameter:

Let’s say the diameter of the circle is 8 units. To find the radius, use the formula r = d / 2:

r = 8 / 2
r = 4

So the radius of the circle is 4 units.

How To Calculate Radius Of Circle from area

To calculate the radius of a circle from its area, you can use the formula A = pi * r^2, where A is the area and r is the radius. Solving for r, we get r = sqrt(A / pi).

Here’s an example of how to use the formula to calculate the radius of a circle from its area:

Let’s say the area of the circle is 50 square units. To find the radius, use the formula r = sqrt(A / pi):

r = sqrt(50 / pi)
r = sqrt(50 / 3.14)
r = sqrt(15.92)
r = 3.99

So the radius of the circle is approximately 3.99 units.

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10 question about find radius of circle

1. What is the formula for finding the radius of a circle from its circumference?
2. What is the formula for finding the radius of a circle from its area?
3. What is the formula for finding the radius of a circle from its diameter?
4. How can you convert the circumference of a circle to its diameter?
5. How can you convert the area of a circle to its diameter?
6. How can you convert the diameter of a circle to its circumference?
7. How can you convert the diameter of a circle to its area?
8. How can you convert the area of a circle to its circumference?
9. How can you convert the circumference of a circle to its area?
10. What is the relationship between the radius, circumference, and area of a circle?

Answer all above

1. The formula for finding the radius of a circle from its circumference is r = C / (2 * pi), where C is the circumference and pi is the mathematical constant approximately equal to 3.14.
2. The formula for finding the radius of a circle from its area is r = sqrt(A / pi), where A is the area and pi is the mathematical constant approximately equal to 3.14.
3. The formula for finding the radius of a circle from its diameter is r = d / 2, where d is the diameter.
4. To convert the circumference of a circle to its diameter, use the formula d = C / pi.
5. To convert the area of a circle to its diameter, use the formula d = sqrt(4 * A / pi).
6. To convert the diameter of a circle to its circumference, use the formula C = d * pi.
7. To convert the diameter of a circle to its area, use the formula A = (d / 2)^2 * pi.
8. To convert the area of a circle to its circumference, use the formula C = 2 * pi * sqrt(A / pi).
9. To convert the circumference of a circle to its area, use the formula A = (C / (2 * pi))^2 * pi.
10. The radius of a circle is half of its diameter, and it determines the size of the circle. The circumference of a circle is the distance around the circle and can be calculated using the formula C = 2 * pi * r. The area of a circle is the measure of the interior of the circle and can be calculated using the formula A = pi * r^2.