Question

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

Answer 1

In one 1 hour, the tip will complete one rotation
radius = 15 cm
so, distance = 2πr = 2×π×15 = 30π cm
                                               = 94.2 cm

Answer 2

Answer:

The distance that the minute hand travels in one hour is 94.29 cm

Solution:

According to the sum,

The radius of the circular clock = Length of the minute hand (r) = 15 cm

Time taken = 1 hour.

The tip of the clock will undergo 1 complete rotation in 1 hour.

∴The distance the minute hand moves in an hour $=2 \pi \times r$

$\begin{array} { c } { = 2 \times \frac { 22 } { 7 } \times 15 } \\\\ { = \frac { 660 } { 7 } = 94.2857 \mathrm { cm } } \\\\ { \approx 94.29 \mathrm { cm } } \end{array}$

Thus, the distance that the minute hand travels in one hour is 94.29 cm