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Triangle LMN has been dilated to form triangle L'M'N'. What is the least amount of information needed to determine if the two triangles are similar?

User Sshongru
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2 Answers

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If two of the interior angles are the same, the triangle is similar. If it is similar, the third angle will automatically also be congruent. 
User Rcjsuen
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If two angles are known to be the same, the triangles are similar! If this is true, then by default the third angle will be the same. So, triangles that have two of the same angles MUST be similar!
User Atn
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