Question

Question 5
It is true that the distance travelled by a circular wheel of diameter d cm in one revolution is $2\pi dcm$? why?

Answer 1

The given statement is is not true because the distance travelled by the wheel in one revolution is equal to its circumference.
$\Rightarrow$ Distance travelled = $\pi d$
$\Rightarrow$ Distance travelled = $\pi \left(2r\right)=2\pi r$ [i.e. Circumference of wheel]