## Jumat, 23 Mei 2008

### Type of Triangle 2

Triangles can also be classified according to their internal angles, described below using degrees of arc:

[1] A right triangle (or right-angled triangle, formerly called a rectangled triangle) has one 90° internal angle (a right angle). The side opposite to the right angle is the hypotenuse; it is the longest side in the right triangle. The other two sides are the legs or catheti (singular: cathetus) of the triangle.

[2] An oblique triangle has no internal angle equal to 90°.

[3] An obtuse triangle is an oblique triangle with one internal angle larger than 90° (an obtuse angle).

An acute triangle is an oblique triangle with internal angles all smaller than 90° (three acute angles). An equilateral triangle is an acute triangle, but not all acute triangles are equilateral triangles

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