Question

two angles that share a side are called: adjacent angles vertical angles supplementary angles complementary angles

Explanation:

To solve this, we analyze each option:

• Adjacent angles: Angles that share a common side and a common vertex (and do not overlap). This matches the description of two angles sharing a side.
• Vertical angles: Opposite angles formed by intersecting lines, they don't share a side.
• Supplementary angles: Angles that add up to \(180^\circ\), the definition is about their sum, not sharing a side.
• Complementary angles: Angles that add up to \(90^\circ\), the definition is about their sum, not sharing a side.

Answer:

A. adjacent angles