An altitude is a line segment in a triangle from a vertex to the side opposite that vertex, and perpendicular to that side. So, in order to construct an altitude, **first swing an arc from the vertex that is large enough to intersect the opposite side twice.**

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## What is an altitude in geometry?

An altitude of a triangle is the perpendicular segment from a vertex of a triangle to the opposite side (or the line containing the opposite side).

## What is an example of altitude in geometry?

The orange line that goes through this triangle is the altitude. This is because it touches a vertex of the triangle. It also forms a right angle as it crosses the opposite side, which is called the base.

## What is an example of altitude?

It describes the angle between the horizon and some point in the sky. For example, if a star is directly overhead, its altitude is 90 degrees. If a star has just set or is just about to rise, it is right at the horizon and has an altitude of 0 degrees.

## Is altitude the same as height?

True altitude is the actual elevation above mean sea level. It is indicated altitude corrected for non-standard temperature and pressure. Height is the vertical distance above a reference point, commonly the terrain elevation.