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2 x Pi x r is equal to the circumference of a circle whose radius is equal to r.
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∙ 11y ago
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What is the formula for circumference of an circle?
circumference = 2*pi*radius or pi* diameter
What does pir2 mean in math terms?
Pi r 2. Pi is a numerical constant roughly 3.142. r is the radius of a circle. 2 in this case is the square of the radius. All this adds up to the area of a circle. Area=Pi x (radius squared)
What is the formula of a semicircle in perimeter?
The perimeter of a semicircle with radius R is pi*R + 2*R = R*(pi + 2)
How do you find the curcumference of a circle if you have the radius?
r=d/2 c=Pi*d 2*r=d c=Pi*2*r where c is the circumference r is the radius and d is the diameter
How do you find the circumference of a circle using the radius?
Circumference = 2*pi*radius So the radius = circumference/2*pi
What does pi radius 2 mean?
That would depend if you mean 2 times the radius times pi (2*pi*r) or the more likely scenario pi times radius squared (pi*r2). 2*pi*r is the formula of the circumference of a 2d circle. Pi*r2 is the formula of the area of a 2d circle.
Is circumference radius times pi?
No it is 2*radius*pi or diameter*pi or 2(pi)r
What is the cicumfrence of a 9cm circle?
The equation for circumference is C = 2*pi*r, where r is the radius of the circle and pi is a constant = 3.14159... Assuming that you mean a 9cm radius, the circumference is therefore: C = 2*pi*r = 2*pi*9cm = 18cm*pi = ~56.549cm
What is the radius of a circle that has the same area and circumference?
Circumference, C = 2*Pi*R Area, A = Pi * R^2 A = C Pi * R^2 = 2*Pi*R --> solve for R (radius) R = 2 So, the radius of a circle with area = circumference is two.
What is the radius of a cylinder with a radius of 1cm and a height of 5cm?
The radius is in the question 1cm the volume is pi * R^2 * H = pi *1 ^ 1 * 5 = 5 * pi surface area pi * 2 * R * 5 + 2 * ( pi * r ^2) = 10 * pi + 2 * pi = 12 * pi
A circle has a circumference of 16 pi inches what is its radius?
The formula where C=circumference, R=radius is C = 2 pi R Since C = 16 pi inches and 16 pi = 2 pi R we can solve for R and get R= 16 pi /2 pi = 8 Therefore the Radius is 8 inches.
What is the formula for circumference of an circle?
circumference = 2*pi*radius or pi* diameter
What does pir2 mean in math terms?
Pi r 2. Pi is a numerical constant roughly 3.142. r is the radius of a circle. 2 in this case is the square of the radius. All this adds up to the area of a circle. Area=Pi x (radius squared)
How do you find the circumference of a circle with just the radius?
The circumference of a circle is equal to the radius times 2*pi. 2*pi*R where R is the radius.
What is the approximate radius of a circle who circunfrance is 45.53 kilometers?
circumference(c)= 2 * pi * radius (r) r = c / ( 2 * pi ) r = 45.53 / 2 * pi r = 7.246 (approx)
What is the radius of a circle if the circumference is 20.5?
Circumference = 2*pi*r r(radius) = Circumference/(2*pi) r = 20.5/6.283185307 = 3.26 ======
What is radius of a circle with a circumference of 7.07?
If the radius is r then the circumference is 2*pi*r So r -= circumference/(2*pi) = 1.13 units.
