Cotton thread is would on a reel which has a diameter of 2.8cm there are 1200 turns of the thread on the reel what is the total length in meters of the thread on the reel
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The total length of the thread wound on the reel is 105.6 meters.
Step-by-step explanation:
- Radius of the reel (r) = diameter/2= 2.8/2 = 1.4 cm
- length of thread in one turn = circumference of the reel
= 2πr (where π = 22/7)
= 2 × 22/7 × 1.4
= 8.8 cm
- ∴ length of thread in 1200 turn = 1200 × 8.8
= 10560 cm
- now, the total length of thread in meter = 10560/100 meter
= 105.6 m
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