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Here are the three circle equations, in words and equations.
Circumfwerence - pi X diameter
C = pi d
Circumference = two X pi X radius
C = 2pi r
Area = pi X radius squared
A = pi r^(2)
NB It is only the radial value that is squared ; NOT 'pi'.
NB pi is a constant at 3.141592..., usually approximated to 3.14 or 3.1416.
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How do you find circumference if you know diameter?
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
What is relation between pie and circle?
It is pi, a letter in the Greek alphabet, and pronounced like pie. This infinite value, usually expressed as 3.14 or sometimes more accurately as 3.1416 is the ratio of the diameter (distance across) a circle, and the circumference (distance around) a circle. The diameter times pi equals the circumference, and the circumference divided by pi gives the diameter. Also, the radius (half the diameter) times itself and then multiplied by pi gives the area inside a circle. The value of pi is the same regardless of the size of a circle.
What is a pie in mathematics?
pi in mathematics is used to determine the circumference of a circle. if you take a piece of string the length of the diameter of the cicle it would go around the circle 3.14159265358978 times (pi).
Why is the circumference of a circle diameter times pi or 2 radius times pi?
Because 2 times the radius is equal to the diameter of the circle
What is the ratio of circumference of a circle to it's diameter?
The circumference of a circle equals pi times the diameter.
How do you solve the diameter of a circle?
pie (3.14) times Diameter
How are radius and diameter alike and different?
Alike: Their in the formula to find the area of the circle pie times radius squared or pie times diameter divided by 2 Different: In a circle, radius is half of the diameter. Example: If the diameter of a circle is 10. Then the radius would be 5.
What is pie r2?
Pie r2 is the formula needed to find out the area of a circle you have to square the radius of the circle (half the diameter of the circle) two times (btw square means times the number by it self) and times the answer by pie which is 3.14
What is the circumference of a 9 in diameter circle?
pie x D = Pie x 9 = 28.3 ( to 1 dp) The circumfrence is roughly 3 times the diameter
What is the area of the circle in terms of pie with a diameter of 36?
The area of a circle, in terms of pie, with a diameter of 36 is: about 324pi
If the diameter of a circle is 7 inches what is the circumference?
circumference of a circle = pie times the diameter = 22/7 x diameter = 22/7 x 7 inches = 22 inches
What is the circumference of a circle that has a diameter of 3.5ft?
Well just multiply 3.5ft times 3.14(pie).
What is is the diameter of a circle whos circumference is 16pie?
What is the diameter of a circle when the circumference is 16 pie
How do you find circumference if you know diameter?
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
The area of circle if its curcumference is 14?
formula for circumference is : C= pie (times) diameter 14= pie Diameter 14=3.14 diameter so divide by pie on both sides to find the diameter aprox: 4.456 = diameter formula for area is : a= pie radius ^2 so find the radius which is half the diameter 4.456/2 =2.228 = radius square the radius 2.228^2= 4.964 times by pie area= 15.597
How do you find the diamter of a circle if you know the area?
In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.
What is the formula of the surface area of a circle?
The area of a circle is pie(22/7) or (3.14) times R2 R = the radius of the circle (1/2 of the diameter)
