Triangles
Triangle side and angle constraints are linked, and special triangles gain additional consequences from equality and symmetry.
What you'll learn
- Use the 180° triangle angle sum in a specifically identified triangle.
- Infer equal opposite angles from equal sides and equal opposite sides from equal angles.
- Classify triangles by stated properties rather than orientation.
- Derive an exterior angle through triangle sum and a straight-line supplement.
- Enumerate all possible angle roles in an isosceles triangle without overlap.
Before you start
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