A triangle is a three sided figure formed by joining three line segments together to form angles. The degree of these angles, and the lengths of the lines, are based upon what triangle is formed. 3 of the main triangles are: equilateral, isoscolece, and right.

**Angle Measure** - Angles can be either straight, right, acute or obtuse. An angle is a fraction of a circle where the whole circle is 360°. A straight angle is the same as half the circle and is 180° whereas a right angle is a quarter of a circle and is 90°. You measure the size of an angle with a protractor.

**Congruency** - The relation between 2 numbers in which the numbers give the same remainder when divided by a given number.

**Orthocenter** - The point where the 3 "altitudes" of a triangle meet

**Circumcenter** - the point where the perpendicular bisectors of a triangle intersect

**Centroid **- the center of mass of a geometric object of uniform density.

**Incenter** - the center of the incircle of a triangle or other figure

Brought to you by Jadyn Belliston and Jarrett Sathre

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Created with images by cogdogblog - "Dusting off Geometry"