M2 Angle

Could somebody explain why the angle between PQ and the horizontal (90-A) is the same as the angle theta in this diagram?

Original post by Mattematics

Could somebody explain why the angle between PQ and the horizontal (90-A) is the same as the angle theta in this diagram?

Two horizontals?

If Ybar-P is a tangent to the horizontal then 90-theta = A

Original post by Mattematics

Could somebody explain why the angle between PQ and the horizontal (90-A) is the same as the angle theta in this diagram?

It's from this question if I remember correctly,

Spoiler

This is my reasoning for it

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