Question

A spool of thread contains 150 revolutions of thread. the diameter of the spool is 3 centimeters. find the length of the thread

Answer 1

The circumference is given by:
C = 2 * pi * r
Where,
r: radio
Substituting we have:
C = 2 * (3.14) * (3/2)
C = 9.42 cm
Then, the length is given by the product of the circumference and the number of revolutions.
We have then:
L = (150) * (9.42)
L = 1413 cm
Answer:
the length of the thread is:
L = 1413 cm