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The area of a circle is 120 inches what is its circumference?
A = pi r2r2 = A/pir2(1/2) = (A/pi)1/2r = (120/pi)1/2r ≈ 6 inC = 2 pi rC = (2)(pi)(6 in)C ≈ 37.7 in
What is the radius of a circle with circumference of 8 inches?
C = 2*pi*r 8 = 2*pi*r 4 = pi*r r = 4/pi
The area of a circle is 28.26 what is the diameter?
Remember the circle equations. A = pi r^2 C = 2 pi r = pi d ( Hence d = 2r) Algebraically rarranging r = sqrt(A/pi) 2r = d = 2(sqrt(A/pi)) Hence d = 2(sqrt(28.26 / 3.141592...)) d = 2(sqrt(8.99543....) d = 2(2.999239...) d = 5.99847.... ~ 6 The answer!!!!!
What happens to the volume of a cylinder if the radius is doubled?
V = (pi)*R2*H if you double the radius then put 2R in place of R in the formula: V = (pi)*(2R)2*H V = 4pi*R2*H So the volume will increase 4 fold if you double the cylinder's radius.
What is the equation for finding the circumference of a circle from the radius?
circumference equal two times 'pi' times radius. It is written algebraically as C = 2pir Since 2r = d (diameter) Then C = pi*d Also the area (A) of a circle is A = pi*r^(2) 'pi' is the constant of proportion of circles. NB For school work pi = 3.14 or pi = 3.1416 or pi = 22/7
What is the formula for finding the diameter with the area?
If Area of a circle = (2)(pi)(r), and diameter = 2r, then: diameter = 2r = Area of circle / pi, where pi = 3.14
If the diameter is 3476 what is the circumference?
The formula for the circumference of a circle is: C=2r(pi) Since diameter is the same as 2r, the circumference is 3476(pi).
The area of a circle is 120 inches what is its circumference?
A = pi r2r2 = A/pir2(1/2) = (A/pi)1/2r = (120/pi)1/2r ≈ 6 inC = 2 pi rC = (2)(pi)(6 in)C ≈ 37.7 in
What is the diameter of a circle if the circumference is 71 feet?
d = 2r Circumference = 2*pi*r 71 = 2*pi*r r = 71/(2*pi) 2r = d = 71/pi d = 22.6 approximately
How do you find diameter of a circle with the diameter 10?
You have answered this question for yourself; the answer is '10' Do you mean to ask ; What is the circumference/area of a circle, with a diameter of '10'?. If so , commit to memory ' elementary school maths. A = pi r^2 C = 2 pi r or pi d . From this 2r = d Hence 2r = 10 r = 5 C = 10 pi = 31.41592.... units A = pi 5^2 = 25 pi = 78.5398... units^2
How many radius squared areas does it take to fill up a circle?
About 3.14159 of them. (pi) The area of a circle is (pi)r2. The area of the square into which the circle can be inscribed is 4r2 or (2r x 2r).
How do you find the radius of a semi circle with an equal perimeter to a rectangle with 1 side 3cm and the other side equal to the radius?
Suppose the radius is R cm. Then the perimeter of the rectangle is 2*(3+R) = 6 + 2R cm. The length of the arc of the semicircle is pi*R and the length of the diameter is 2*R so the perimeter of the semicircle is pi*R + 2R The two perimeters are equal so 6 + 2r = pi*R + 2R That is, 6 = pi*R and so R = 6/pi
What is the diameter of a circle if the circumference is 13.4?
If I rememember my geometry correctly, the circumference (C) of a circle is defined by the equation C=2r(pi), where r=the radius of the circle. So:13.4=2r(pi)13.4/pi = 2r divide each side of the equation by pi13.4/3.14 = 2r substitute the rough equivalent value of pi into the equation.divide to find the value of 2r.given that the diameter (d) of a circle = 2r, you have your answer.*** I'm sorry, but it HAS been a while since I've had to compute diameters and I DID originally have the wrong equation. The answer as currently written IS correct, however.
What is the formula for finding circumference of a semi-circle?
2r+pi r
If the radius of a circle is 5 centimeters what is it's circumference?
2r*pi
How do you find the diameter and area of a shape?
Do you mean of a circle? D = 2r A = (pi)r(squared) {Sorry, I don't have the actual symbols on my phone}
Can the area of a circle ever equal the circumference of a circle?
No, no it can't. Circumference = 2r*pi Area = pi*r2 For the area to equal the circumference pi*r2 = pi*2r so divide both sides by pi r2 = 2r so divide both sides by r r = 2 Note that circumference is in units and area is in units squared i.e. radius = 2m, area = 12.56637m2 Ciercumference = 12.56637 m
