Description
In this lesson, students are introduced to the idea of finding the equation of a line perpendicular to a given line through a given point. Students are led to the notion of the slopes of perpendicular lines being negative reciprocals by showing the 90° rotation of a slope triangle.
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Credits
From EngageNY.org of the New York State Education Department. Geometry Module 4, Topic A, Lesson 4.
Available from engageny.org/resource/geometry-module-4-topic-a-lesson-4; accessed 2015-05-29.
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