Triangle

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is... Wikipedia

• Edges and vertices:  3
• Schläfli symbol:  (for equilateral)
• Area:  various methods, see below
• Internal angle (degrees):  60° (for equilateral)
• Data source:  DuckDuckGo