A man walks 15 metres to the front and then 15 metres to his right. Then, each time turning to his left, he walks 5 metres, 20 metres and 20 metres respectively. How far is the man from the starting point?

The man is just 5 metres from the start.

Facing north, 15 m gives (0,15); right 15 m gives (15,15).

Left 5 m north gives (15,20).

Left 20 m west gives (-5,20).

Left 20 m south gives (-5,0).

Distance to (0,0) = 5 metres.