question_answer 33)

The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in 1 hour, \[\left( \text{Take }\pi =\text{3}.\text{14} \right)\]

Answer:

                Length of the minute hand of the circular clock \[=\text{15 cm}\] \[\Rightarrow \]               Radius of the circular clock (r) \[~=\text{15 cm}\] \[\therefore \]                  Circumference of the circular clock   \[\text{= 2 }\!\!\pi\!\!\text{ r = 2  }\!\!\times\!\!\text{  3}\text{.14  }\!\!\times\!\!\text{  15cm = 94}\text{.2 cm}\] \[\Rightarrow \]               Length moved by the tip of the minute hand in 1 hour \[=\text{94}.\text{2 cm}\] [As the minute hand makes one complete revolution round the clock in 1 hour].