Here's a formula to find the circumference of a circle
c = 2 × π × r
Multiplication has commutative property, we can change the order of operands without changing the result. I move 2 to the right.
c = π × 2 × r
Remember d = 2 × r
c = π × d
The answer is true. The circumference of a circle can be found by multiplying pi by the diameter
