If the minute hand on a clock is 4.5 centimeters long what distance does the tip travel in one complete rotation?

Minute hand is 4.5 cm

Tip of the minute hand completes one complete circle with radius 4.5 cm

hence the distance traveled by the tip of minute hand is

(2 * 22/7 * 4.5 ) ( circumference of the circle 2 pi R )