Question

Answer
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Answer 1

1: 31.42

2: 144.51

3: 43.98

4: 59.69

5: 75.4

6: 106.81

How to:

2 · 3.14 · the radius= the circumference

Answer 2

I’ll do the first one for you
5 x 2 = 10
10pi = around 31.42

You are really just multiplying the diameter by pi, if you are only given the radius, double it first