Key Concepts:
- Triangle Angle Sum Theorem – The sum of the three interior angles of any triangle is (180°).
- Sum of Interior Angles of a Polygon with $n$ sides: ((n-2) \cdot 180°)
- Isosceles Triangle Properties – A triangle with two equal sides has two equal angles opposite these sides.
- Equilateral Triangle Properties – A triangle with three equal sides has three (60°) angles.
- Right Triangle Properties – A triangle with one (90°) angle; the two acute angles are complementary.
- Exterior Angle Theorem – An exterior angle of a triangle is equal to the sum of the two remote interior angles.
Skills Covered:
- Finding unknown angles in a triangle using the Triangle Angle Sum Theorem.
- Identifying base angles in an isosceles triangle and solving for missing angles.
- Applying the Exterior Angle Theorem to find unknown angles in geometric diagrams.