Question

The hour hand of a wall clock is 21cm long. How far does it travel in 12 hours

Answer 1

Answer:

One full rotation

Step-by-step explanation:

Answer 2

Answer: 132 cm.

Step-by-step explanation:Given

The hour hand of the clock is 21cm long

we know that an hour hand covers 30° in 1hr

so in 12 hrs it will cover 12×30° = 360°

Now 360° clearly means that the hour hand makes one full round...

So the distance covered by the hour hand is the circumference of the clock

which is 2πr

where r is 21cm.

2×22/7×21=132 cm.