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Guided Notes
2/5/14
Classifying Triangles + Triangle Sum Theorem
Triangles can be classified two ways—by their angles and by their sides.
If classifying by angles:
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Acute triangle: a triangle with 3 acute (less than 90 degrees) angles.
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Right triangle: a triangle with one right (90 degree angle) angle.
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Obtuse Triangle: a triangle with one obtuse (greater than 90 degrees) angle.
If classifying by sides:

Equilateral triangle: all sides and angles are congruent (equal).

Isosceles triangle: 2 sides and 2 angles are congruent.
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Scalene triangle: no sides or angles are congruent.
Triangle Sum Theorem—this states that all angles in a triangle will sum to 180 degrees.
Look on pg. 336-337 for examples.