TRIANGLES_RACHAEL 5L

Vertex

The vertex (plural: vertices) is a corner of the triangle. Every triangle has three vertices.

Base

The base of a triangle can be any one of the three sides, usually the one drawn at the bottom. You can pick any side you like to be the base. Commonly used as a reference side for calculating the area of the triangle. In an isosceles triangle, the base is usually taken to be the unequal side.

Altitude

The altitude of a triangle is the perpendicular from the base to the opposite vertex. (The base may need to be extended). Since there are three possible bases, there are also three possible altitudes. The three altitudes intersect at a single point, called the orthocenter of the triangle. See Orthocenter of Triangle. In the figure above, you can see one possible base and its corresponding altitude displayed.

Median

The median of a triangle is a line from a vertex to the midpoint of the opposite side. The three medians intersect at a single point, called the centroid of the triangle. See Centrod of a Triangles.

Area

See area of triangle and Heron's formula.

Perimeter

The distance around the triangle. The sum of its sides. See Perimeter and a Triangles. SO IF YOU WANT TO KNOW MORE ABOUT TRIANGLES SEARH IT IN GOOGLE! HAVE FUN!!!