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PA, QB, and RC denote the perpendicular lines drawn from the three vertices: P( x
1
, y
1
), Q( x
2
, y
2
), and R( x
3
, y
3
) respectively of triangle △PQR. H( x, y) represents the point where the three altitudes of the triangle intersect.
Step 1: To calculate the slope of the triangle's sides using the formula:
The slope is calculated using the formula:
