Order the following sets of numbers from least to greatest:

15, √ 18 (4.24), 2𝝅 (6.3)

Sqrt18, 2pi, 15

√18 β‰ˆ 4.24

2πœ‹ β‰ˆ 6.3
15

So the correct order from least to greatest is:
√18 β‰ˆ 4.24, 2πœ‹ β‰ˆ 6.3, 15