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Triangles

Autor:P Porras, Tiina_Valkonen, GeoGebra Materials Team, Anthony
Sum of all angles is  180°. The area of a triangle can be solved with the formula   where a is the base of the triangle and h is the perpendicular height of the triangle. There are three special cases of triangles and all of them have features simplifying solving:
  • equilateral triangle: all sides are equal and all angles are 60°.
  • isosceles triangle: two sides of a triangle equal. Thus, base angles are also equal.
  • right-angled triangle: one angle is 90°.
The height of an isosceles or an equilateral triangle bisects the base into two equal parts. Identifying the parts of a triangle must be done in a systematic way: a vertex is marked with uppercase letters (e.g. A), the corresponding lowercase letter for the side opposite the vertex (a), and the angle at the vertex is marked with a corresponding greek letter ( ). Identifying is done anticlockwise.
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