Triangle Types Sample Problems

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Triangle Types

A triangle is a three-sided shape. There are different types of triangles.

Triangle types based on side length:

Equilateral Triangle
All three sides are equal length. Isosceles Triangle
Two sides are equal length. Scalene Triangle
Three unequal sides.

Triangle types based on angles:

Acute Triangle
All three angles are acute, or less than 90^o. Right Triangle
One angle is 90^o. Obtuse Triangle
One angle is obtuse, or greater than 90^o.


Equilateral Triangle All three sides are equal length.	Isosceles Triangle Two sides are equal length.	Scalene Triangle Three unequal sides.


Acute Triangle All three angles are acute, or less than 90^o.	Right Triangle One angle is 90^o.	Obtuse Triangle One angle is obtuse, or greater than 90^o.