Special right triangle

"45-45-90 triangle" and "30-60-90 triangle" redirect here. For the drawing tool, see Set square.

A special right triangle is a right triangle with some notable feature that makes calculations on the triangle easier, or for which simple formulas exist.

The various relationships between the angles and sides of such triangles allow one to quickly calculate some useful quantities in geometric problems without resorting to more advanced methods.

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