All About Geometry

The angle bisectors of the interior angles of a triangle are concurrent. Their point of intersection is called the Incenter . The incenter...

An angle bisector is a line that divides an angle into two equal parts. If you draw two intersecting lines on a piece of paper, you should b...

The perpendicular bisectors of the sides of a triangle are concurrent. Their point of intersection is called the circumcenter . The circum...

The perpendicular bisector of a line segment AB is a line that is perpendicular to AB and passes through the midpoint of segment AB. What to...

The altitudes of a triangle are concurrent (i.e. they meet at a single point). Their point of intersection is called the orthocenter . The ...

Area = (1/2)(base)(height) Note: Two differently shaped triangles can have the same area. Why is this true?

Height = Altitude (same thing) The altitude is not always inside the triangle (e.g. an obtuse triangle).