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How many triangles are there in a combined shape? What mathematical formula is used?
1, draw countless line segments from the vertex of the triangle, and combine them with the opposite side to form several large and small triangles;

Calculation method: There are several points on the side segment, (number of points-1)× number of points ÷2= total number of triangles.

2. Irregular triangles can only be counted step by step.