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Formulas: Perimeter, Circumference, Area

### Let Pythagoras show you how Pythagorean Theorem was discovered!

How did Pythagoras come up with his Pythagorean Theorem for Right Triangles? (The sum of the squares of the two legs is equal to the square of the hypotenuse.) Let Pythagoras himself show your students his graphical method! Worksheet by teacher Daniel Evans. Pythagorean Theorem by Pythagoras. (He w...

### Trigonometry Definitions - EEWeb

An Engineers Quick Trigonometry Definition Reference

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### SpyGearCo Dot Net

Just another WordPress site

### Trigonometry (mathematics): What are the most important trigonometric identities?

I’m afraid that deciding which trigonometric identities are the most important is a matter of opinion, but I’ll list the ones that I believe are the most important and the reasons why I believe they are. The most important trigonometric identitie...

### Law of Sines and Law of Cosines - Puzzle Worksheet

Law of Sines and Law of Cosines Geometry Puzzle worksheet. Trigonometry Activity for high school level math classroom.

### Sine Curve Equation

### Trigonometry: Proving Trigonometric Identities

**Notice:** This post was updated on March 10, 2015 to reflect a correction in the Trigonometric Identities image. The accompanying Google Document was also corrected, as was the link to that Document. If you downloaded the Google Document before 03/10/2015, please re-visit this link and download the new version. Thank you, and sorry for the inconvenience. CLICK HERE to view the YouTube video that corresponds to this post. Identity problems are probably the toughest part of Trigonometry for…

### Jean Adams

Browse over 980 educational resources created by Jean Adams in the official Teachers Pay Teachers store.

Trig Identities

Trig Identities