Chapter 12

ANGLES

KHAN ACADEMY

Chapter 12: Angles

This section of Khan Academy offers a basic tutorial on the basics of angles including naming angles, angle measurement, angles and circumference, measuring angles in degrees, using a protractor, and constructing angles.

http://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-geometry-topic/cc-4th-angles/v/angle-basics

Chapter 12: Angles (Advanced)

This is a collection of Sal Khan’s old angle videos.  It includes an introduction to angles, angles formed by transversals and parallel lines, complementary and supplementary angles, acute right and obtuse angles.

http://www.khanacademy.org/math/geometry/parallel-and-perpendicular-lines/old_angles/v/the-angle-game