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First, how many degrees would the hand move in a full minute?

360?

Yes! So if 60 seconds is 360 degrees, how many degrees would 20 seconds be?

120

Awesome! Do you know how to convert degrees to radians?

one second

2π/3

Yes!

That was the first part :)
Now for the second part

Do you know how to find circumference of a circle?

yes , πd

(pi * diameter)

Yep, we know that the minute hand is 4 inches, so that would be the radius.

so ( pi * 4 )

???