Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
Pi is basically the relationship between the circumference and diameter of a circle. (c/d). If you divide the circumference by the diameter you will always get pi, since C=Pi times d (or 2 times pi times radius), so circumference (C) divided by diameter (D) is Pi.
15
15 x (8/4) + 2 = 15 x 2 + 2 = 32
2/pi is about 0.6366197724
4 times pi times 4 divided by 2 is 78.9568352087
It is 2*pi/3.
4
(pi*r2)/2 + 4000
Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
2
the area of a circle is pi times radius2. half a circle is pi times radius2 divided by 2.
Area of a circle is: pi times radius squared
pi is not divided into anything - unless you specify pi/2 or pi/3.6
9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.
Pi times pi equals 9.869604401089358 (to 15 decimal places).The square value 9.8696 is commonly used.If you use (pi)2 = 10 in your calculations, your answer is only wrong by about 1.3% .
3x + 15/2