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.
The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)
Circumference of a circle = 2*pi*radius or diameter*pi
Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm
It is: 2 to 3 respectively
circumference of the circle = 4*pi cm
The circumference of a circle with a radius of 4cm is: 25.13 cm (r x 2 x pi)
Circumference of a circle = 2*pi*radius or diameter*pi
The ratio of the circumference of a circle with radius 4 cm to its area is 1:2.
radius=4cm diameter=8cm *radius is half the diameter
Circumference = Pi X Diameter = 3.1415 X 4cm = 12.566cm
C=3.14*d<----diameter d=r*2 ex: what is the circumference of a circle if the radius is 4cm? 4*2=8cm 3.14*8=25.12cm c=25.12cm
A circumference of 12.57 cm
It is: 2 to 3 respectively
circumference of the circle = 4*pi cm
Circumference equals 2 x the radius x pi. 4(2) = 8 So, the circumference is 8 pi. However, if you want to calculate the actual value, multiply those two together and you get roughly 25.1.
Circumference of a circle is C=2pir C=2pi(4) C=8pi C=25.12 cm Where pi is the ratio of the circumference to the diameter of any circle, approximately 3.14. There is usually a button for pi on scientific/graphing calculators.
4cm