More Lessons for Grade 9 Math
Videos, worksheets, games and activities to help Geometry students learn how to construct the altitude of a triangle.
Altitudes are defined as perpendicular line segments from the vertex to the line containing the opposite side. In each triangle, there are three triangle altitudes, one from each vertex. In an acute triangle, all altitudes lie within the triangle. In a right triangle, the altitude for two of the vertices are the sides of the triangle. In an obtuse triangle, the altitude from the largest angle is outside of the triangle.
This video looks at drawing altitude lines in acute, right and obtuse triangles. 3 altitude lines intersect at a common point called the orthocentre.
Constructing an altitude inside of the triangle
Using a compass and a straight edge to create the altitude of a triangle that lies inside the triangle.
Constructing an altitude outside the triangle
Using a straight edge and a compass to construct an altitude outside of the triangle
Constructing an altitude of a triangle
This video discusses how to construct an altitude of a triangle using a safety compass.
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