A spool of thread has an average radius of 1.00 cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool?

Answer 1

First, remember the formula for the Circumference of a circle:

C = 2Πr [We know the average radius]

C = 2*3.14*1.00 cm

6.28 cm/turn

There is 62.8 m of thread.

: (62.8 m) * ( (100 cm) / (1 m) ) * ( 1 turn) / (6.28 cm) )

100 turns