Geometryhard · Past Paper
Two parallel lines are intersected by a transversal. If the bisectors of two co-interior angles meet at a point, what is the angle formed at that point?
A45 degrees
B60 degrees
C90 degrees
D120 degrees
✓ Correct Answer: C — 90 degrees
Co-interior angles sum to 180. Their halves sum to 90. In the triangle formed, the third angle must be 180 - 90 = 90.
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