Construct an angle of 90° at the initial point of the given ray.
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Step-by-step explanation:
Construct an angle of 90° at the initial point of a given ray and justify the construction.
Taking O as centre and some radius, draw an arc of a circle, which intersects OA, say at a point B.
Taking B as centre and with the same radius as before, draw an are intersecting the previously drawn are, say at a point C.
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