PrepSwift Tangent Lines Question 3

Hi there!

I’m struggling to understand why angle ∠PCQ cannot be 90°. The explanation in the solution doesn’t make sense to me. It mentions that it’s not a tangent line, but tangents are usually relevant when discussing the angle between a radius (from the center to the point of tangency) and the tangent itself.

From my perspective, it seems entirely possible for ∠PCQ to be 90°, for example, if points P, C, and Q form a 45°–45°–90° triangle. Could you please clarify why this configuration is supposedly impossible?

Thanks in advance!

Yes, you’re right. It certainly can be 90 degrees too.

Jovyn is correct - the solution has been updated to fix this error.