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### Introduction to Euclidean geometry : The Golden Ratio

##### By: Sal Khan

An introduction to one of the most amazing ideas/numbers in mathematics

This topic introduces the basic conceptual tools that underpin our journey through Euclidean geometry. These include the ideas of points, lines, line segments, rays, and planes.

### Introduction to Euclidean geometry : Euclid as the Father of Geometry

##### By: Sal Khan

Euclid and his Elements (and how much Abraham Lincoln liked them)

This topic introduces the basic conceptual tools that underpin our journey through Euclidean geometry. These include the ideas of points, lines, line segments, rays, and planes.

### Introduction to Euclidean geometry : Lines, Line Segments, and Rays

##### By: Sal Khan

Difference between lines, line segments, and rays

This topic introduces the basic conceptual tools that underpin our journey through Euclidean geometry. These include the ideas of points, lines, line segments, rays, and planes.

### Introduction to Euclidean geometry : Identifying Rays

##### By: Sal Khan, Monterey Institute for Technology and Education

Identifying Rays

This topic introduces the basic conceptual tools that underpin our journey through Euclidean geometry. These include the ideas of points, lines, line segments, rays, and planes.

Geometry

### Angle basics and measurement : Acute Right and Obtuse Angles

##### By: Sal Khan

The difference between acute, obtuse and right angles

This topic continues our journey through the world of Euclid by helping us understand angles and how they can relate to each other.

### Altitudes : Proof - Triangle Altitudes are Concurrent (Orthocenter)

##### By: Sal Khan

Showing that any triangle can be the medial triangle for some larger triangle. Using this to show that the altitudes of a triangle are concurrent (at the orthocenter).

You probably like triangles. You think they are useful. They show up a lot. What you'll see in this topic is that they are far more magical and mystical than you ever imagined!

### Andlegir Sálmar Og Kvaeði Þess Guðhraedda Kennimans Og Þjóðskálds ...

##### By: Hallgrimur Pétursson

Geometry ; Least squares

### Medians and centroids : Triangle Medians and Centroids

##### By: Sal Khan

Seeing that the centroid is 2/3 of the way along every median

You probably like triangles. You think they are useful. They show up a lot. What you'll see in this topic is that they are far more magical and mystical than you ever imagined!

### Quadrilaterals : Rhombus Diagonals

##### By: Sal Khan

Proof that the diagonals of a rhombus are perpendicular bisectors of each other

This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on prov

### Geometry and Faith a Supplement to the Ninth Bridgewater Treatise

##### By: Thoma Hill
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