You can put this solution on YOUR website! Similar triangles are the same shape but not the same size. This means that corresponding angles of the two triangles are congruent, and that the corresponding sides are in the same ratio. This ratio is called the scale factor.
Two triangles are similar if:
1) 3 angles of 1 triangle are the same as 3 angles of the other
or 2) 3 pairs of corresponding sides are in the same ratio
or 3) An angle of 1 triangle is the same as the angle of the other triangle and the sides containing these angles are in the same ratio.
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