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4:32
Khan Academy
Sal Khan
Triangle altitude equation
Given a triangle on a coordinate plane and a base that is neither horizontal nor vertical, let's find the equation of the line that contains the altitude of the triangle relative to that base. We can use the fact that the slope of the altitude is perpendicular to the slope of the base. That means the two slopes are opposite reciprocals of each ...
5 months ago
Parallel and Perpendicular Lines in Geometry
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14 VERY UNFAIR Math Games - Parallel & Perpendicular Lines - Geometry No Prep
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4 months ago
14 BIG UNFAIR Math Games - Parallel & Perpendicular Lines - Geometry No Prep
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