Search "geometry"
Complementary and supplementary angles
Basics of complementary, supplementary, adjacent and straight angles. Also touching on what it means to be perpendicular
Khan Academy
Angles
517
08:30
Acute right and obtuse angles
The difference between acute, obtuse and right angles
Khan Academy
Angle basics and measurement
506
05:31
Measuring angles
Using the KA virtual protractor to measure angles
Khan Academy
Angle basics and measurement
493
04:04
Measuring angles in degrees
How to measure an angle in degrees
Khan Academy
Angle basics and measurement
494
08:21
Angle basics
Definition of an angle. How to denote an angle using points on the angle (including the vertex)
Khan Academy
Angle basics and measurement
496
06:48
Language and notation of the circle
Formal definition of a circle. Tangent and secant lines. Diameters and radii. major and minor arcs
Euclid as the father of geometry
Euclid and his Elements (and how much Abraham Lincoln liked them)
Solid geometry volume
Volume of triangular prisms and cubes
Khan Academy
Area, volume, and surface area
560
03:55
Lines, line segments, and rays
Difference between lines, line segments, and rays
Triangle angle example 1
Figuring out angles in a triangle. A little about exterior angles being the sum of the remote interior angles
Khan Academy
Triangle angles
505
06:02
Language and notation of basic geometry
Understanding basic ideas in geometry and how we represent them with symbols
Khan Academy
Measuring segments
498
12:57
