Math Question

In this coordinate plane, the slope of line a is equal to the opposite reciprocal of the slope of line \( b \).
To prove that line a is perpendicular to line \( b \), Tracy wants to first prove that \( \triangle L M N \) is similar to \( \triangle K L N \). Which of the following similarity theorems can Tracy use in her proof?
Side-Side-Side similarity theorem
Side-Angle-Side similarity theorem
Angle-Angle similarity theorem



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