Your challenge is to mark the points between the rays PA and PB (both included) which lie at a certain distance, say 'd', from a point P, as shown. PC = d. How many such points exist?
Infinite points, between the rays PA and PB
To locate points which are equidistant from P and at a distance 'd', take a compass, with P as centre and radius as 'd', draw an arc which cuts the rays PA and PB at C and D as shown.
Now, all the points on this arc CD are at a distance 'd' from P and hence they fall into our solution domain.
Hence the number of such points are infinite.