Question

What is the circumference of a circle with radius 1 ?

Answer 1

Answer: 6.28

Step-by-step explanation: Using the formula 2×pie×radius

Circumference=2×3.14×1

=6.28

Answer 2

Explanation:

C = circumference

r = radius

d = diameter

C = 2
`\pi`r or C =
`\pi`d

I will be using the second formula since it is what I prefer but please note that when using the first the only thing being multiplied by two is the radius, not pi.

d = 2r

d = 2 * 1

d = 2

C = 2
`\pi`