Changes

[[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.

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 on 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:

:<math>a^2 + b^2 = c^2</math>

:<math>a^2 + b^2 = c^2</math>