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Earn +20 ptsQ: What does 2 pi r or 2 pi radius mean?
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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
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