Hi, what do you want to do?
FuseSchool
MATHS - Geometry - Constructing Angles
In this video, we are going to look at how to construct different angles using only a compass and a ruler.
Let's Tute
How to Construct a Perpendicular Bisector of a Line Segment
This video teaches how to construct a perpendicular bisector of a given line segment using a compass and straightedge. By drawing arcs above and below the line segment and finding their intersection points, a straight line can be drawn...
Professor Dave Explains
Special Lines in Triangles: Bisectors, Medians, and Altitudes
Working with triangles.
Khan Academy
Khan Academy: Perpendicular Radius Bisects Chord
Proof that if a radius is perpendicular to a chord then it bisects the chord. This video also appears in the Geometry: Circles strand. [6:57]
Khan Academy
Khan Academy: Geometry:sss to Show a Radius Is Perpendicular to Chord It Bisects
Explains how to prove that a radius is perpendicular to a chord that it bisects by using the side-side-side triangle congruence postulate. [8:19]
Khan Academy
Khan Academy: Geometry: Euler Line
Demonstrates that the circumcenter, orthocenter, and centroid of a triangle all lie on a line called an Euler line. [6:12]
Khan Academy
Khan Academy: Geometry: Circumcenter of a Triangle
Explains using multiple proofs that a point on a perpendicular bisector is equidistant from the endpoints of the segment it bisects. Proofs use triangle congruency postulates. Lays the foundation for understanding the circumcenter of a...
Virtual Nerd
Virtual Nerd: What Is a Perpendicular Bisector?
This tutorial takes a look at perpendicular bisectors and illustrates what the term means. [3:23]
Khan Academy
Khan Academy: Formal Understanding of Congruence
Simple proof using RSH postulate to show that a radius perpendicular to a chord bisects it
Khan Academy
Khan Academy: Sss to Show a Radius Is Perpendicular to a Chord That It Bisects
More on the difference between a theorem and axiom. Proving a cool result using SSS.
Khan Academy
Khan Academy: Triangles: Euler Line
A video demonstration of the magic and mystery of the Euler Line.
Sophia Learning
Sophia: Area of Regular Polygons
This video lesson demonstrates how to find the area of any regular polygon using the apothem. Students can check their understanding with an assessment.
Khan Academy
Khan Academy: Geometry: Euler's Line Proof
Proves that the circumcenter, orthocenter, and centroid all lie on the same line, the Euler line. Proof relies on understanding of properties of similar triangles and properties of special parts of a triangle. [9:50]