Question

The diameter of a cart wheel is $2.1m.$ Find the distance traveled when it completes $100$ revolutions.

• A. $105\pi$
• B. $52.5\pi$
• C. $420\pi$
• D. $210\pi$

Answer 1

The correct option is D $210\pi$

To find the distance covered in one revolution, we have to find the circumference of the circle.

The distance traveled after one revolution = Circumference of the wheel

The distance traveled after $100$ revolutions $=100\times$ {Circumference of the wheel}
$=100\times \pi \times d$
$=100\times \pi \times 2.1$ ($\because$ d = 2.1)
$=210\pi$