Question

the minute hand of a circular clock is 15cm long.how for does the tip of the minute hand move in 1 hour .

Answer 1

Here, the tip of minute hand covers a circle of radius 15 cm. For 1 hr, it can rotate only once.
Total distance traveled =
$2 \times \pi \times r \\ = 2 \times 3.142 \times 15 \\ = 94.248cm$