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Unformatted text preview: a triangle with a right angle (90°) Example: Obtuse triangle (p. 65) - a triangle with an obtuse angle Example: Types of triangles You can classify a triangle by the number of congruent sides it has. no congruent sides 2 or 3 congruent sides all sides congruent Scalene Isosceles Equilateral You can also classify a triangle by the measures of its angles. 3 acute angles a right angle an obtuse angle all angles congruent Acute Right Obtuse Equiangular Triangle sum property The sum of the angle measures of a triangle is 180°. m / A + m / B + m / C = 180° You can use this property when finding unknown angle measures of a triangle....
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