Supplementary angles add up to 180 degrees
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There are many angles inside a circle. You have inscribed angles, right angles, and central angles. These angles are formed from using chords, secants, and tangents.
not all congruent angles are vertical angles. Vertical angles must share a vertex.
No, all angles are right angles
Obtuse angles.
A triangle has three internal angles and three external angles, for a total of six angles.