Math: Triangle

The Right Triangle
The right triangle has one 90 degrees angle and two acute (< 90 degrees) angles.  Since the sum of the angles of a triangle is always 180 degrees...

y + z = 90 degrees

The two sides of the triangle that are by the right angle are called the legs...  and the side opposite of the right angle is called the hypotenuse.

The Equilateral Triangle

In the equilateral triangle, all the sides are the same length (congruent) and all the angles are the same size (congruent).  Since the sum of the angles of a triangle is always 180 degrees, we can figure out the measure of the angles of an equilateral triangle: 180