-The large hand of a clock is 71.12cm long. How many centimetres does its extremity move in 20 minutes?
A)120.00cm
B)148.95cm
C)150.00cm
D)160.00cm

Question

Quizplus · Accepted Answer

The extremity of the large hand describes the circumference of a circle with a radius of 71.12 cm. The circumference of a circle is given by the formula $C = 2\pi r$, where $r$ is the radius. Thus, the total circumference is $C = 2 \times \pi \times 71.12 \approx 446.8$ cm. In 60 minutes, the hand covers the entire circumference, so in 20 minutes, it covers $\frac{1}{3}$ of the circumference, which is approximately $446.8 \div 3 \approx 148.93$ cm, rounded to $148.95$ cm.

-The Large Hand of a Clock Is 71