the triangles will be equivalent if all their sides are equal
the angles 1 and 2 will be equals since AC bisect two lines that are parallel to each other the same thing happens with BD the angles that this line forms with the upper and lower sides form two equal angles
finally the angles of the center are congruent since they are opposite by the vertex and this makes them of equal measure
showing that all the angles are equal we can say that the triangles are equivalent
