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The ideas in this geometry lesson are taken from the Geometry ebook that I sell at MathMammoth.com. This lesson plan does not contain all the problems the Geometry ebook does.

Altitude of a triangle
Free geometry lesson plan from HomeschoolMath.net

The altitude of a triangle is a line segment from one vertex of a triangle to the opposite side so that the line segment is PERPENDICULAR to the side. Look at the pictures. In other words,

(1) it starts at a vertex and
(2) is perpendicular to the side.

Note how the altitude of an obtuse triangle can fall outside of the triangle.


You can draw the altitude from ANY vertex of the triangle.		In fact, to every triangle you can draw three different altitudes. Note in the last picture how amazingly they all three intersect in the same point!

To find the altitude with a protractor,
position your protractor so that the
straight edge of it will go through
the vertex of the triangle, and the
90 degree mark will be lined up
with the side of the triangle.
Look at the pictures.

For big size triangles you have
to use the other method which
uses compass and ruler. That
is taught later.

[Pictures available in the ebook]

Example problem types

1. Draw one altitude to each of the triangles. You can choose which vertex you want to draw it from.

[Pictures available in the ebook]

Next geometry lesson

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Altitude of a triangle Free geometry lesson plan from HomeschoolMath.net

Example problem types

Altitude of a triangle
Free geometry lesson plan from HomeschoolMath.net