Q:
# What Is the Definition of the "altitude of a Triangle"?

**The altitude of a triangle is defined as the line drawn from the vertex of a triangle and perpendicular to the opposite side of the triangle.** A triangle has three sides and three vertices. Hence, it has three altitudes.

Altitudes may also lie outside a triangle. In a triangle with all three acute angles, all altitudes lie within the triangle. For an obtuse angled triangle, one or more altitudes may lie outside the triangle.

The altitudes of a triangle are useful when calculating the area of the triangle. The area of a triangle is half the product of its base and the corresponding altitude.

All three altitudes of a triangle intersect at a point called the orthocenter. The orthocenter may lie inside or outside the triangle.

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