The triangles that could not be similar to triangle ABC include the following:
A. triangle MNO.
B. triangle DEF.
In Geometry, two triangles are said to be similar when the ratio of their corresponding side lengths are equal and their corresponding angles are congruent.
Additionally, the lengths of corresponding side lengths are proportional to the lengths of corresponding altitudes when two triangles are similar.
Based on the side, angle, side (SSS) similarity postulate, we can logically deduce the following proportional side lengths to triangles ABC;
AB/BC = GH/HI = JK/KL
12/5 = 6/2.5 = 36/15
2.4 = 2.4 = 2.4
For triangle MNO, we have:
MN/NO = 35/12 ≠ 2.4
For triangle DEF, we have:
DE/EF = 8/6 ≠ 2.4