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[[Image:Rtriangle.svg|thumb|A typical right triangle]]

[[Image:Rtriangle.svg|thumb|A typical right triangle]]

A '''right triangle''' has three sides and an angle that equals 90º - that is, a ''right'' angle.

A '''right triangle''' has three sides and an angle that equals 90º - that is, a [[right angle]].

The general right triangle is the subject of one of the more famous mathematical ideas, the [[Pythagorean Theorem]].  It states that the sum of the squares of the legs (short sides) of a right triangle is equal to the square on the [[hypotenuse]] (the long side, opposite the [[right angle]]).  Using the figure to the right, this means:

The general right triangle is the subject of one of the more famous mathematical ideas, the [[Pythagorean Theorem]].  It states that the sum of the squares of the legs (short sides) of a right triangle is equal to the square on the [[hypotenuse]] (the long side, opposite the [[right angle]]).  Using the figure to the right, this means:

The analysis of ratios between sides of right triangles with hypotenuse = 1 is at the heart of [[trigonometry]].

The analysis of ratios between sides of right triangles with hypotenuse = 1 is at the heart of [[trigonometry]].

[[category:geometry]]

[[category:Plane Geometry]]