Question

Some help about PI!

Answer 1

Lets look at the definition of \[\pi \]

Answer 2

I think the answer is A or B

Answer 3

Pi=3.14

Answer 4

pi = circumference / diameter => circumference = pi * diameter

diameter = 2 * r
=> circumference = pi * 2 * r
or
circumference = \[2 \pi r\]

Answer 5

So i think the answer should be "D"

Answer 6

Thank you @xavier123

Answer 7

Since your familiar with this material, and I'm not would you mind helping me if I tag you in a new question?

Answer 8

sure