Algebra - 3rd Edition

Chapter 13: Right Triangle Relationships

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http://www.gcseguide.co.uk/similar_triangles.htm
This page gives a brief description of similar triangles.

http://www.cut-the-knot.org/pythagoras/index.shtml
This page defines the Pythagorean Theorem and has several proofs explaining it.

http://www.mathsisfun.com/pythagoras.html
This site explains the Pythagorean Theorem and has pictures showing the sides of a triangle.

http://www.themathpage.com/aTrig/Radicals.htm
This page contains an explanation of radicals, rational, and irrational numbers and had questions with interactive answers.

http://www.onlinemathlearning.com/special-right-triangles.html
This site explains the special right triangles and tells the lengths of their sides.

http://www.regentsprep.org/regents/math/algtrig/ATT2/Ltri45.htm
NEW This page explains the 45-45-90 special right triangle.

http://www.regentsprep.org/regents/math/algtrig/ATT2/Ltri30.htm
NEW This page explains the 30-60-90 special right triangle.

http://www.tpub.com/math1/20b.htm
This site defines what trigonometric ratios are, gives the six basic, and states their abbreviations.

http://mathsfirst.massey.ac.nz/Trig/TrigRatio.htm
This page stages the six most common trigonometric ratios and has an interactive triangle to practice deciphering one ratio from the other.

http://www.purplemath.com/modules/solverad.htm
NEW This page explains how to solve equations containing radicals and has examples.

http://tutorial.math.lamar.edu/Classes/Alg/SolveRadicalEqns.aspx
NEW A tutorial with detailed explanations on how to solve equations that contain radicals (square root).

http://www.cliffsnotes.com/math/algebra/algebra-ii/quadratics-in-one-variable/solving-radical-equations
NEW Step-by-step details for how to solve equations where there is a variable under the radical (square root).