18. Triangles & Symmetry

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18.01 Types of Triangles

18.02a Angles in a Triangle

18.02b Angles in a Triangle with Algebra

18.03 Perimeter of a Triangle

18.04 Area of a Triangle

18.05a Lines of Symmetry

18.05b Rotational Symmetry

18.06a Planes of Symmetry

18.06b Axes of Symmetry