Question

A thread is wound 200 times round a reel of diameter 5cm. Use the value 3 for (pie) to find the approximate length of the thread in metres.

Answer 1

Answer:

30 m

Step-by-step explanation:

d = 5cm

therefore, r = 2.5cm

circumference = 2πr

                        = 2 x 3 x 2.5

                        = 15cm

Now,

Length of thread = 15 x 200 ==> 3000cm ==> 30 m