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What can you say about the ratio of circumference to the diameter of the circles?
Wiki User
∙ 12y ago
For any size circle, the ratio of the circumference to the diameter is constant. This constant is known as pi, an irrational number which is approximately equal to 3.1416.
Since the Circumference is pi times Diameter. (C=Ï€D)
Therefore the ratio of Circumference to Diameter is π:1.
Wiki User
∙ 12y ago
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If you double the diameter of a circle what happens to the circle's circumference?
I would think it would double also. Say Circle A has a diameter of 1 inch and Circle B has a diameter of 2 inches. To get the circumference, you multiply the diameter by pi (3.14). So 1 x 3.14 = 3.14 so that is the circumference of Circle A. To get the circumference of Circle B you need to multiply 2 x 3.14 = 6.28. And 6.28 is twice 3.14 so I would think the circumference doubles.
What is the widthof a circle 14 feet in circumference?
When you say width, I think you mean diameter 14 = pi x diameter diameter = 14/pi = 14/3.1415 = 4.456 feet
Can you measure the speed of a car by ratio?
Yes. To do so, you will need your transmission gear ratios, your differential gear ratio and your tire circumference. You can derive the tire circumference by mutliplying its diameter by 3.1416 (pi).Example: At highway speed your RPM is 2000. Say your overdrive (5th gear) is 0.84:1, your differential gear ratio is 3.73:1 and your tire circumference for a P215/75R15 is 87". First divide the RPM by the first ratio (.84) which gives you 2380 RPMS. Then divide by the differential ratio of 3.73 gives you 638.3 RPM (Wheel speed). You speed is 87"x 638.3 = 55,532 inches per minute or 52.6 MPH.Hope that helps!
What is the circumference of a circle with a radius of 4 inches?
The formula for finding the circumference is the diameter times pi because the radius is half of the diameter, the diameter of this circle would be 8 8 times pi equals approximately 25.1327 Or you could leave it in terms of pi and say 8pi (using the symbol)
What is an example of circumference?
A cicumference is the perimeter or distance around the edge of a circle. To get the circumference you use the following equation: C=πd (3.1416 x diameter) where n = pi and is always 3.1416 Example: Say you have a circle with the diameter of 2 in. (diameter of circle)x(pi)= 2 in. x 3.1416 = 6.2832 So the circumference of a circle with a diameter of 2 in. is 6.2832 which means the circle is 6.2832 in. around the outside edge.
What is the ratio of PI circles?
In a circle Pi it the ratio of the circumference to the diameter. That is to say, if C is the cirumference and D is the diamter of any circle, we have: Pi=C/D
How will derive the value of pi?
the value of pi can be derived as the ratio between the circumference and diameter of every circle, say pi = circumference/diameter
Why is pi used to measure circles?
Pi is the ratio of the circumference ( the perimeter) of a circle to its diameter. You might have learned in school that if C is the circumference of the circle., then C=2Pir or C=pixd from which we say pi = C/d or the ratio of the circumference of the circle to its diameter. This has been known since ancient times! William Jones gave us the symbol we currently use for it. This comes from the 16th letter in the Greek alphabet. So we use it to measure circles because of what it is.
What is the relationship between the circumference of a circle and its diameter?
The circumference of a circle is equal to pi times its diameter. Another way to say this is that for any circle, circumference divided by diameter will always have pi as the answer, regardless of the size of the circle.
What is the area of a circle with 4mm?
You neglected to say whether the 4mm is the radius of the circle, or the diameter,or the circumference. Each possibility leads to a different area.
If you double the diameter of a circle what happens to the circle's circumference?
I would think it would double also. Say Circle A has a diameter of 1 inch and Circle B has a diameter of 2 inches. To get the circumference, you multiply the diameter by pi (3.14). So 1 x 3.14 = 3.14 so that is the circumference of Circle A. To get the circumference of Circle B you need to multiply 2 x 3.14 = 6.28. And 6.28 is twice 3.14 so I would think the circumference doubles.
How do you you calculation the diameter with circumferance?
The formula for circumference is Pi x D= Circumference. If you know the circumference you solve for the diameter as you would any other variable. Let's say the circumference is 10, the equation would then be: Pi (3.14) x D = 10. Solve for D. D= 10/3.14
How do you get a circumference of a circle?
to get the circumference of a circle you must multiply pi times diameter so say the circle's diameter was 8, you would do you 8 x pi (3.14 in this case) = 25.12 . that would be the circumference. the formula is circumference = pi (3.14) x diameter ! here's some extra information, to get the area of a circle you have to multiply pi and the radius of the circle squared. so say the circles radius is 2, then you have to square 3 which is 9. to square a number you have to take that number and multiply it by itself , in this case i did 3x3 to get the radius squared. OK, so now that i have the radius squared you need to multiply it by pi. which is 3.14 , so 9 x 3.14 = 28.26 the formula is area = pi x radius squared.
What is the widthof a circle 14 feet in circumference?
When you say width, I think you mean diameter 14 = pi x diameter diameter = 14/pi = 14/3.1415 = 4.456 feet
What is the diameter of 84?
This is missing some information. For instance, it does not say what 84 is. Is it the radius, the circumference? See the link below for a step by step guide to finding a diameter.
Can you measure the speed of a car by ratio?
Yes. To do so, you will need your transmission gear ratios, your differential gear ratio and your tire circumference. You can derive the tire circumference by mutliplying its diameter by 3.1416 (pi).Example: At highway speed your RPM is 2000. Say your overdrive (5th gear) is 0.84:1, your differential gear ratio is 3.73:1 and your tire circumference for a P215/75R15 is 87". First divide the RPM by the first ratio (.84) which gives you 2380 RPMS. Then divide by the differential ratio of 3.73 gives you 638.3 RPM (Wheel speed). You speed is 87"x 638.3 = 55,532 inches per minute or 52.6 MPH.Hope that helps!
How do you find circumfrence?
The process you would use to find the circumference of a circle completely depends on what information you already have about the circle. For example, you might be given the circle's area, or its radius, or its diameter, or the length of one radian of arc along the circumference, and each of those would require a different method to find the circumference. The easiest example is the one where you know the circle's diameter. In that case, simply multiply the diameter by (pi) to get the circumference. The next easiest case is the one where you have the circle's radius ... let's say the radius is 1.5 meters. Knowing that the radius is half of the diameter, you first double the radius, and find that the diameter 3.0 meters. Then you get the circumference just as you did in the first example ... multiply the diameter by (pi). With a radius of 1.5 meter, you would find that the circumference is about 9.425 meters. (rounded)
