According to the partial construction shown what is the next step in consructing a line perpendicular to point off a line

With compass at P, draw an arc that intersects a in two places.

Explanation:

A compass can be used to draw different types of curves and lines. An arc is a curve which is a part of a circle. In order to sketch a perpendicular line to a given point off a line, a compass can be used. The compass rigid leg will be placed at a specific point and the other leg with the lead will be used to make the necessary arc.

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