The question in English is as follows:
How far does a bicycle wheel with a diameter of 40cm go in one turn?
The diameter of the wheel = d = 40 cm
So, the radius of the wheel = r = 0.5 d = 0.5 * 40 = 20 cm
we need to find the circumference of the wheel
So, it will be:
![2\pi\cdot r=2\cdot3.14\cdot20=125.6\operatorname{cm}]()
So, the bicycle will travel a distance of 125.6 in one turn
So, the answer will be 125.6 cm