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For the "catch all" and most broad type of triangles, there are 3:
Obtuse - 1 angle > 90°
Acute - all angles < 90°
Right - 1 angle exactly 90°
There are more specific categories, such as isosceles triangles, which can be obtuse, right or acute triangles that contain exactly 2 angles of equal degree, and exactly 2 sides of equal lengths.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoThere are three primary types of triangle - the equilateral, where all three sides are equal in length - the isoceles, where only two sides are equal in length - and the scalene, where no sides are equal in length.
The right triangle, where one angle is 90 degrees, is a special case of isoceles or scalene.
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