2 x pi x 2 = 4 x pi
Chat with our AI personalities
Well, you find the area of a circle by multiplying (pi times radius2) or (pi times radius times radius). The radius is half of the diameter. The formula for the circumference is (pi times diameter). Multiply the radius times 2 to get the diameter. Multiply the diameter times pi.
Circumference of a circle: pi times diameter
It is still equal to pi (3.1416) because when you multiply anything by 1 no matter how many times you multiply it, you end up with that other number.
Multiply 2 times pi (3.14 OR 22/7) times the radius 2(pi)r
You have to multiply the diameter by pi (3.14) If you have the area, that means you multiplied pi by radius squared. Now you just have to multiply the radius by two, then multiply that number by pi.