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The first step to calculate circumference of a circle is to know the formula. There are two formulas that can be used for the purpose. They are:
- Circumference of a circle formula 1: C = π x diameter
- Circumference of a circle formula 2: C = π x 2 radius
Here are a few illustrations that would make problem solving related to finding the circumference of a circle easy:
Using the Radius:
If the value of the radius is known then it can be put in the 'circumference of a circle equation' already mentioned and the value calculated. For example:
Given that the radius of circle is 3 cm.
Circumference of the circle: C= π x 2 radius
or, C= 3.14 x 2 (3) cm
or, C= 18.84 cm
Using the Diameter:
If the value of the diameter is known it can be directly put in the 'circumference of a circle equation' and the circumference calculated. For example:
Given that the diameter of a circle is 6 cm.
Circumference of the circle: C= π x diameter
or, C= 3.14 x 6 cm
or, C= 18.84 cm
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How do you find the circumfernece of a circle?
If you want an approximate answer, you can measure it with string. If you want an exact answer and know the radius, multiply by 2*pi to find the circumference.
How many linear INCHES in a 37 inch diameter circle?
I assume you want the circumference which is pi times the diameter, so for 37 inch diameter the circumference would be about 116.24 inches.
The area of a circle is 81 pi square feet What is the radius?
The area is 9 feet. You find the square root of 81 which is 9. I want circumference, not area.
What is the circumference of a circle with a 4cm radius?
Circumference equals 2 x the radius x pi. 4(2) = 8 So, the circumference is 8 pi. However, if you want to calculate the actual value, multiply those two together and you get roughly 25.1.
How do you calculate the length of the circle?
You do that by using the information you're given, combined with the facts you know about a circle. Unfortunately, you haven't described either of those categories in your question. Probably the most important fact you'll need to know about a circle ... the one that this test-question is designed to check you on ... is the formula for the circumference of a circle: Circumference = (pi) times (diameter). We're noticing that you don't know that formula, and you're still calling the circumference of a circle the "length", so we want to suggest that you make an appointment with your teacher to get together, and review a few things that you're still not sure of.
What formula do you use if you know the diameter of a circle and want to find the circumference?
circumference of a circle = pi * diameter.
What is the radius and the area of a circle?
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
How do you find the circumference of a triangle?
circumference is only in a circle. Circumference only applies to circles, ellipses, or other round objects. If you want to find the "perimeter," add up all three sides.
How do you find the circumfernece of a circle?
If you want an approximate answer, you can measure it with string. If you want an exact answer and know the radius, multiply by 2*pi to find the circumference.
Do answers for circumference need to be squared or cubed?
The circumference of a circle is a distance. It's the distance you would drive to go around the circle. If you straighten it out, you have a line. It's a simple length, and doesn't involve squares or cubes. If they give you the radius of a circle and u want to find the circumference u have to do 2* TT* r and if they give u the diameter u do TT*d
How do you convert area of circle if you know the circumference?
It depends on what you want to convert the area of the circle into.
What is the diameter of a circle with 52cm as circumference?
16.55cm - If you want to work it out, you will need to divide the circumference by pi.
What is the circumference of a diameter of 18in?
Diameters don't have "circumference." If you want the circumference of a circle with diameter 18 in, then it is just pi*d = 18pi inches.
How do you find the area of a circle if the circumference is 10?
We know that the area of a circle is pi * r2. We also know that the circumference of a circle is pi * d. Therefore, when you know the circumference of a circle and want to know the area, divide the circumference by pi to give you the diameter of the circle, divide the diameter by 2 to give you the radius, square the radius and then multiply by pi to get the area. So, 10/pi = 3.183. 3.183/2 = 1.5915. 1.59152 = 2.533 2.533 * pi = 7.958 to 3 decimal places. The area of your circle is therefore 7.958cm2.
How many linear INCHES in a 37 inch diameter circle?
I assume you want the circumference which is pi times the diameter, so for 37 inch diameter the circumference would be about 116.24 inches.
Can there be more than 4 radius in a circle?
Yes, providing that they stem from the center of the circle to its circumference.
How do you work out the perimeter of a third of a circle?
The circumference of a circle is pi times the diameter. If you want a third of that, divide by 3. (Pi is approximately 3.14) Then to get the perimeter add the diameter to the circumference of the 1/3 of the circle.
