A triangle is a figure that consists of three points that are not lying on one straight line, and three segments connecting these points in pairs. Points are called vertices, and segments are sides of a triangle.
A, B and C are the vertices of the triangle. AB, BC and CA are sides of a triangle.
A triangle is indicated by an indication of its vertices: a triangle ABC.
Instead of the word triangle the symbol Δ is used. those. Δ ABC.
The angle of the triangle ABC at the vertex A (or the angle between the sides AB and AC) is the angle formed by the rays AB and AC; ∠A = BAC = ∠CAB. |
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Planometry
Terms: Planometry