Mathematics for IGCSE & O level - Angles (Section 2 - No. 6)
What is the relationship between co-interior angles (also known as same-side interior angles) formed by a transversal and two parallel lines?
They are equal.
They are supplementary.
They are complementary.
They are always acute.
Giải thích
Co-interior angles are supplementary (add up to 180°).