Alex wants to construct a line segment through R that makes the same angle with line segment QR as line segment PQ. The figure below shows a step to construct a congruent angle at R:

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Answer : To construct a line segment through R which would have the same angle with line segment QR . With the co-relation of segment QR which is same to segment PQ which means that angle Q and angle R are corresponding angles.

So, to construct the same angle with the segment keep the pointed compass end on R by measuring the same distance at the angle Q. Just draw the curve at R and there you are.