Construct an angle of `45^@` at the initial point of a given ray and justify the construction.

Explanation

Draw a ray `OA`

Taking `O` as cnter and any radiys draw an arc cutting `OA` at `B`.



Taking `B` as centerr and with the same radius as before, draw an arc intersecting the previously drawn arc at `C`.

With `C` as center and same radius draw an arch cuttung the arc at `D`.



With `C` and `D` as center and radius more than `1/2CD`, draw two arcs intersecting at `P`.



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