Question

I'm Adding more question, not 3 left a lot more lol sorry. Pictures below

Answer 1

6.283

Explanation:

c=2πr

c=2π1

c=6.283 (rounded down)

When a circle has a radius of 1, you can pretty much just multiply π by 2 to get the circumfrence.

Answer 2

6.28

Explanation:

C=2πr=2·π·1≈6.28319