Download scalene triangle

8-6 Classifying Triangles
Learn to classify triangles by their side
lengths and angle measures.
Course 2
8-6 Classifying
Insert Lesson
Title Here
Triangles
Vocabulary
scalene triangle
isosceles triangle
equilateral triangle
acute triangle
obtuse triangle
right triangle
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides.
Triangles classified by sides
A scalene triangle
has no congruent sides.
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides.
Triangles classified by sides
An isosceles triangle
has at least 2 congruent sides
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides.
Triangles classified by sides
In an equilateral triangle, all of the
sides are congruent.
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides. Another way is by the measures of
their angles.
Triangles classified by angles
In an acute triangle, all of the
angles are acute.
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides. Another way is by the measures of
their angles.
Triangles classified by angles
An obtuse triangle has
one obtuse angle.
Course 2
8-6 Classifying Triangles
One way to classify triangles is by the lengths of
their sides. Another way is by the measures of
their angles.
Triangles classified by angles
A right triangle
has one right angle.
Course 2
8-6 Classifying Triangles
Additional Example 1: Classifying Triangles
Classify each triangle according to its sides
and angles.
A. isosceles Two congruent sides
acute
Three acute angles
This is an isosceles acute triangle.
B. scalene
right
No congruent sides
One right angle
This is a scalene right triangle.
Course 2
8-6 Classifying Triangles
Additional Example 1: Classifying Triangles
Classify each triangle according to its sides
and angles.
C. equilateral Three congruent sides
acute
Three acute angles
This is a equilateral acute triangle.
D. scalene
right
No congruent sides
One right angle
This is a scalene right triangle.
Course 2
8-6 Insert
Lesson
Title Here
Classifying
Triangles
Check It Out: Example 1
Classify each triangle according to its sides
and angles.
A. isosceles Two congruent sides
obtuse
One obtuse angle
This is an isosceles obtuse triangle.
B. isosceles
right
Two congruent sides
One right angle
This is an isosceles right triangle.
Course 2
8-6 Insert
Lesson
Title Here
Classifying
Triangles
Check It Out: Example 1
Classify each triangle according to its sides
and angles.
C. scalene
obtuse
No congruent sides
One angle exceeding 90°
This is a scalene obtuse triangle.
D. scalene
obtuse
No congruent sides
One angle exceeding 90°
This is a scalene obtuse triangle.
Course 2