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The radius and circumference of a circle are related by the constant pi, no matter the size of your circle. So for this particular circle, we need to double the radius to find the diameter. (The diameter goes all the way across the circle through the center, while the radius only goes from the center to the outer edge. You can think of the diameter as two radii -- yes, that's the plural of radius -- put back-to-back.) Now that we know the diameter is 8 cm, we just have to multiply it by pi. The easiest approximation for pi to use in this sort of problem is 3.14, so 8x3.14 is 25.12.
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What is the circumference of a circle with a radius of 4cm?
The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)
What is the circumference of a 4cm circle?
Circumference of a circle = 2*pi*radius or diameter*pi
What is the circumference of a circle if the diameter is 4cm?
Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm
What is the ratio of the circumference of circle A that is 4cm to the circumference of circle B that is 6cm?
It is: 2 to 3 respectively
What is the circumference for d equals 4cm?
circumference of the circle = 4*pi cm
