Altitude is the height of a shape. The point where all altitudes of a closed shape meet is called the orthocenter.
To FIND an altitude rest one flat side of the shape on the "ground" and measure straight up to the point furthest from the ground. In other words, measure at a right angle from the line segment forming one side across to a line segment or vertex on the opposite side.
Example: Altitude of a square, measure any side -- the altitude of the "top" is the same height as any other side, since all sides are at right angles and the distance from the bottom to the top is the same anywhere on the square.
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The altitude of a triangle IS a geometric concept so it intersects geometry in its very existence.
It can be used as a side length, which has many possibilities to figure with.
In geometry, a perpendicular segment that connects a vertex to its opposite side is the altitude of a triangle. Triangles have three altitudes, according to this definition for altitude.
to find the altitude of a triangle you connect each vertex perpendicularly to the opposite segment all three points will meet at one point known as the orthocenter -9th grader
Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few