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Some links are repeated for use with more than one lesson.

12.1  Similar Triangles

Similar Triangles

This site defines similar figures.

12.2  The Pythagorean Theorem

Pythagorean Theorem

This site has multiple proofs of the Pythagorean Theorem.

12.3  Irrational Numbers and Radicals

12.4  Special Right Triangles

Right Triangle Trigonometric Ratios

This site shows the graphs of right triangle trigonometry.

12.5  Trigonometric Ratios

Right Triangle Trigonometric Ratios

This site shows the graphs of right triangle trigonometry.

12.6  Solving Equations Containing Radicals