Triangle Properties:
Vertex: The Vertex is a corner of the triangle. Every triangle has three vertices.
Base: The base of a triangle can be one and all 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 suggestion side for calculating the area of the triangle. In an isosceles triangle, the bottom is usually taken to be the unequal side.
Altitude: The altitude of a triangle is the at right angles from the base to the opposite vertex. (The base may need to be extended). Since there are three likely bases, there are also three likely altitudes. The three altitudes meet at a single point, called the orthocenter of the triangle. See Orthocenter of a Triangle.
Median: The median of a triangle is a line up from a vertex to the midpoint of the opposite side. The three medians meet at a single point, called the centroid of the triangle. See Centroid of a Triangle.
Area: See area of the triangle and Heron's formula.
Perimeter: The distance around the triangle. The sum of its sides. See Perimeter of a Triangle. This could also help us on fifth grade math
Interior angles: The three angles on the within of the triangles at each vertex. See Interior angles of a triangle
Exterior angles: The angle between a face of a triangle and the extension of an adjacent side. See Exterior angles of a triangle.
