What is the answer to the circumference of a circle?

Asked By: Jeshua Frankel | Last Updated: 17th April, 2020
Category: science space and astronomy
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The formula for the circumference of a circle is the product of pi (π) and the diameter or twice the product of pi (π) and the radius. Example: Find the circumference of the circle with a diameter of 8 inches. Answer: The circumference of the circle is 8π ≈ 25.163 inches.

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In respect to this, what unit is used for circumference of a circle?

To find the circumference of a circle, take its diameter times pi, which is 3.14. For example, if the diameter of a circle is 10 centimeters, then its circumference is 31.4 centimeters. If you only know the radius, which is half the length of the diameter, you can take the radius times 2 pi, or 6.28.

Also Know, what is the formula for area? Area is measured in square units such as square inches, square feet or square meters. To find the area of a rectangle, multiply the length by the width. The formula is: A = L * W where A is the area, L is the length, W is the width, and * means multiply.

Likewise, people ask, what is the circumference of a 12 inch circle?

Circumference & Areas

Size in Inches Circumference Inches Area in Square Inches
12 37.700 144.000
12 1/4 38.480 150.060
12 1/2 39.270 156.250
12 3/4 40.060 162.560

What is the area of a semicircle?

Area of a Semicircle 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.

33 Related Question Answers Found

What is the radius of a circle?

A radius is a straight line from the center of a circle to the circumference of a circle. If you have two or more of them, they are referred to as radii. All radii in a circle will be the same length.

What is circumference of the base?

Circumference of base = 132 cm.

What is the symbol for circumference?

Symbol Name
π Pi
d Diameter
C Circumference
r Radius

Is the circumference of a circle squared?

The usual definition of pi is the ratio of the circumference of a circle to its diameter, so that the circumference of a circle is pi times the diameter, or 2 pi times the radius. This give a geometric justification that the area of a circle really is "pi r squared".

How do you find a diameter?


To calculate the diameter of a circle, multiply the radius by 2. If you don't have the radius, divide the circumference of the circle by π to get the diameter. If you don't have the radius or the circumference, divide the area of the circle by π and then find that number's square root to get the radius.

How do you calculate area of a circle?

To find the area of a circle with the radius, square the radius, or multiply it by itself. Then, multiply the squared radius by pi, or 3.14, to get the area.

What is the radius of a circle calculator?

Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm . You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm² . Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm .

What is the area of a 12 foot circle?

Area of a 12 Foot Circle
452.39 square feet
65,144 square inches
42.028 square meters
420,283 square centimeters

How much is a radius?

radius is always half the length of its diameter. For example, if the diameter is 4 cm, the radius equals 4 cm ÷ 2 = 2 cm.

What is the circumference of a 12 inch pipe?


Pipe Sizes Info
Standard Nipples and Pipe Sizing
Pipe Size Outside Diameter (O.D.) Circumference
5" 5.563" 17.476"
6" 6.625" 20.812"
8" 8.625" 27.095"

What is the formula for radius?

The two formulas that are useful for finding the radius of a circle are C=2*pi*r and A=pi*r^2. We use algebra skills in solving for our variable r. We know that the constant pi is always 3.14. Another word related to the radius is diameter, which is always twice the radius.

What is the area of a 12 inch pizza?

We already know that a 12-inch pizza has a surface area of 113.04 square inches, so we divide five-ounces by 113.04 = 0.0442321 ounces of sauce per square inch of surface area.

How do I find the length of an arc?

To find arc length, start by dividing the arc's central angle in degrees by 360. Then, multiply that number by the radius of the circle. Finally, multiply that number by 2 × pi to find the arc length.

What are the formulas for circles?

Circle Formulas in Math :
  • Area of a circle (A ) = π r 2 =( π/4 ) D2 = 0.7854 D2
  • Diameter of a circle (D) = √(A/0.7854).
  • Here angle between two radii is ” θ” in degrees. .
  • The area of the sector = (θ/2) r 2
  • Sector angle of a circle θ = (180 x l )/ (π r ).
  • Perimeter of the segment = (θ π r / 180) + 2r sin (θ/2).

What is the area of circumference?


The area of a circle is given by the formula A = π r2, where A is the area and r is the radius. The circumference of a circle is C = 2 π r. If we "solve for r" in the second equation, we have r = C / (2 π ).

Why is the area of a circle πr2?

The height becomes equal to the radius, while the length is half of the circumference (C = 2πR) which now finds itself running along the top and bottom. As the number of triangles “approaches infinity” the circle can be taken apart and rearranged to fit almost perfectly into an “R by πR” box with an area of πR2.

What is a formula of a circle?

The center-radius form of the circle equation is in the format (x – h)2 + (y – k)2 = r2, with the center being at the point (h, k) and the radius being "r". This form of the equation is helpful, since you can easily find the center and the radius.