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Published byCalvin Cobb Modified over 8 years ago

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**Geometry Section 9.4 Special Right Triangle Formulas**

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**What must we know in order to use the Pythagorean Theorem?**

Two sides of a right triangle.

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**In section 9. 2, we examine two special right triangles**

In section 9.2, we examine two special right triangles. They are special because we only need to know the length of 1 side to find the length of the other two sides.

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or Isosceles Right Triangle In a triangle, the hypotenuse is equal to the length of a leg times____.

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**Examples: Find the length of x and y.**

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**Example: Find the perimeter of a square with diagonals of length 25cm.**

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In a triangle, the hypotenuse equals two times the shorter leg and the longer leg equals the shorter leg times

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**Examples: Find the length of x and y.**

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**Example: Find the length of the altitudes in an equilateral triangle that has sides of length 20cm.**

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