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# 8.4: 45-45-90 Right Triangles

Difficulty Level: At Grade Created by: CK-12
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Practice 45-45-90 Right Triangles

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### Vocabulary Language: English

45-45-90 Theorem

For any isosceles right triangle, if the legs are x units long, the hypotenuse is always x$\sqrt{2}$.

45-45-90 Triangle

A 45-45-90 triangle is a special right triangle with angles of $45^\circ$, $45^\circ$, and $90^\circ$.

Hypotenuse

The hypotenuse of a right triangle is the longest side of the right triangle. It is across from the right angle.

Legs of a Right Triangle

The legs of a right triangle are the two shorter sides of the right triangle. Legs are adjacent to the right angle.

Radical

The $\sqrt{}$, or square root, sign.

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Date Created:
Jul 17, 2012
Last Modified:
Aug 02, 2016
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MAT.GEO.642.L.2