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Lesson 4­1 Classifying Triangles with answers.notebook
November 14, 2014
Questions/Main Ideas Lesson 4­1 Classifying Triangles
Classifying Triangles by Angles
acute triangle ­ all angles are acute (less than 90)
obtuse triangle ­ one angle is obtuse (greater than 90)
right triangle ­ one angle is right (equal to 90)
equiangular triangle ­ an acute triangle with all angles congruent
Questions/Main Ideas Example 1
Classify each triangle as acute, equiangular, obtuse, or right.
a.
b.
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Lesson 4­1 Classifying Triangles with answers.notebook
November 14, 2014
Questions/Main Ideas Example 2
Classify ΔXYZ as acute, obtuse, right, or equiangular. Explain your reasoning.
Questions/Main Ideas Classifying Triangles by Sides
scalene triangle ­ no two sides are congruent (all sides are different lengths)
isosceles triangle ­ at least two sides are congruent
equilateral triangle ­ all three sides are congruent
(note: an equilateral triangle is also an isosceles triangle)
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Lesson 4­1 Classifying Triangles with answers.notebook
November 14, 2014
Questions/Main Ideas Example 3
The triangular truss below is modeled for steel construction. Classify ΔJMN, ΔJKO, and ΔOLN as acute, equiangular, obtuse, or right.
Questions/Main Ideas Example 4
If point Y is the midpoint of VX, and WY = 3.0 units, classify ΔVWY as equilateral, isosceles, or scalene. Explain your reasoning.
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Lesson 4­1 Classifying Triangles with answers.notebook
November 14, 2014
Questions/Main Ideas Example 5
Find the measures of the sides of isosceles triangle KLM with base KL.
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