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# Right Triangles

### Section 3.1 Labeling Right Triangles and the Pythagorean Theorem

TermDefinition
right triangle a triangle with a 90º angle
reference angle the angle we are referring to when labeling opposite and adjacent sides of a right triangle
opposite side the side of a right triangle opposite the reference angle
adjacent side the side of a right triangle next to the reference angle
hypotenuse the side of a right triangle opposite the right angle; the longest side of a right triangle
Pythagorean Theorem the sum of the lengths of the two legs of a right triangle squared is equal to the length of the hypotenuse squared; resulting in the formula a^2 + b^2 = c^2, where c is the length of the hypotenuse
acute angle an angle whose measure is less than 90°
Created by: ewilkins