# 2_1 notes - a triangle with a right angle(90° Example...

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Ch 2 Section 1 Classifying Triangles Triangle (p. 64) - the figure formed by the segments whose endpoints are three points. Example: Sides (p. 65) - the segments that form a triangle Example: Vertices (p. 65) - the endpoints of the sides of a triangle (singular: vertex ) Example: Scalene triangle (p. 65) - a triangle with no congruent sides Example: Isosceles triangle (p. 65) - a triangle with at least two congruent sides Example Equilateral triangle (p. 65) - a triangle with three congruent sides Example: Equiangular triangle (p. 65) - a triangle with three congruent angles Example: Acute triangle (p. 65) - a triangle with three acute angles Example: Right triangle (p. 65) -

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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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2_1 notes - a triangle with a right angle(90° Example...

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