Sum of all the sides of a triangle

Sum of all interior angles of a triangle

The triangle that has all congruent sides

The triangle that has two congruent sides

The triangle that has a 90 degrees angle

the center of gravity of the triangle

The intersection of the medians of the triangle

The height of a triangle

The perpendicular built from a point to the opposite side

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Geometry

Propreties of the triangles

Term	Definition
Perimeter	Sum of all the sides of a triangle
180°	Sum of all interior angles of a triangle
Equilateral triangle	The triangle that has all congruent sides
Isosceles triangle	The triangle that has two congruent sides
Right-angle triangle	The triangle that has a 90 degrees angle
the center of gravity of the triangle	The intersection of the medians of the triangle
The height of a triangle	The perpendicular built from a point to the opposite side