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Monday, 2024-03-18, 11:54 PM
Examples of triangles:

triangle graphic

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The area of a triangle:

triangle graphic

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The sum of the angles of a triangle:

triangle graphic

Always, always, ALWAYS!

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The Pythagorean Theorem:

triangle graphic

This formula is for right triangles only!
The sides, a and b, of a right triangle are called the legs, and the side that is opposite to the right (90 degree) angle, c, is called the hypotenuse.  This formula will help you find the length of either a, b or c, if you are given the lengths of the other two.

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Some special Pythagorean numbers:
These are called Pythagorean triples. 

triangle graphic                  triangle graphic

The reason that they are so special is that they are whole numbers -- none of those weird decimals, fractions or radicals!

Special Triangles:

triangle graphic

The 30-60-90 Triangle:
If you have one side, you can use these formulas (and maybe a little algebra) to get the others.

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triangle graphicThe 45-45-90 Triangle:
If you have one side, you can use these formulas (and maybe a little algebra) to get the others.
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