formula for orthocentre of a triangle
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y2-y1/x2-x1
for a slope of line
perpendicular slope is -1 /slope of line
and for finding equation
y2-y1=m(x2-x1)
for a slope of line
perpendicular slope is -1 /slope of line
and for finding equation
y2-y1=m(x2-x1)
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