Question

The minute hand of a circular clock is $15cm$ long. How far does the tip of the minute hand move in $1$ hour. (Take $\pi =3.14$)

Answer 1

Distance moved by minute hand in $1$ hour$=$Circumference of the circle made by minute hand.

Radius$=r=15$cm

Circumference$=2\pi r=2\times 3.14\times 15$

$=\frac{314}{100}\times 30$

$=\frac{942}{10}=94.2$cm

$\therefore$ Minute hand moves $94.2$cm in one hour.