4: Triangles
- Page ID
- 442
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- 4.4: Isosceles Triangles
- Properties of triangles with two equal sides/angles.
- 4.23: Medians
- Line segment that joins a vertex and the midpoint of the opposite side of a triangle.
- 4.36: Distance and Triangle Classification Using the Pythagorean Theorem
- Find missing sides to calculate the area.
Thumbnail: Diagram of two congruent triangles. \(\triangle\ ABC \cong\ \triangle\ DEF\) (CC BY-SA; Merovingian via Wikipedia)