Question

construct an angle of 90° at the initial point of a given ray and justify the construction

Answer 1

from the initial point draw an arc cutting the at c from c draw an arc cutting previous arc at d again with d as center draw another arc cutting the same arc at e now draw an arc from d and from e in upward direction and make them to bisect each other at f join the point f to the initial point . the required angle is 90