 # Geometry - 4th Edition

## Chapter 7: Right Triangles

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

Please report broken links to Kathy Kral

### This site applies to the entire chapter.

http://www.freemathhelp.com/Lessons/PreAlgebra_Right_Triangles_BB.htm This site contains a video tutorial with notes on right triangles.

### 7.1  Squares and Square Roots

http://www.mathsisfun.com/square-root.html
This page defines and explains squares and square roots.

### 7.2  The Pythagorean Theorem

http://www.mathsisfun.com/pythagoras.html
This site explains the Pythagorean Theorem, explains examples, and contains animations to show triangle sides relating to each other.

http://www.mathwizz.com/geometry/help/help1.htm
This page contains the definition of the Pythagorean Theorem and an example.

### 7.3  Special Right Triangles

http://www.onlinemathlearning.com/special-right-triangles.html
This site explains the special right triangles and gives examples.

http://www.regentsprep.org/regents/math/algtrig/ATT2/indexATT2.htm
NEW This page explains and provides practice problems for the 30-60-90 and 45-45-90 special right triangles.

### 7.4  The Tangent Ratio

http://www.teacherschoice.com.au/Maths_Library/Trigonometry/tangent_ratio.htm This page explains the tangent ratio with pictures.

### 7.5  Sine and Cosine Ratios

http://www.teacherschoice.com.au/Maths_Library/Trigonometry/sine_ratio_1.htm This page explains the sine ratio with pictures.

http://www.teacherschoice.com.au/Maths_Library/Trigonometry/cosine_ratio_1.htm This page explains the cosine ratio with pictures.

### 7.6  Law of Sines and Law of Cosines

http://www.freemathhelp.com/Lessons/Geometry_Law_of_Sines_BB.htm This site contains a video tutorial with notes on the law of sines.

http://www.themathpage.com/aTrig/law-of-sines.htm
This site explains the laws of sines, including the ambiguous case.

http://www.freemathhelp.com/Lessons/Geometry_Law_of_Cosines_BB.htm This site contains a video tutorial with notes on the law of cosines.

http://www.themathpage.com/aTrig/law-of-cosines.htm
This page explains the laws of cosines.