9'4 Classifying Triangles

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9.4 Classifying Triangles
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Classifying Triangles
You can classify triangles by two different ways
By their angles
By their sides
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Classifying Triangles By Angles
An acute triangle has 3 acute angles
A right triangle has 1 right angle
An obtuse triangle has 1 obtuse angle.
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Classifying By Angles Cont.
Classify the triangle by its angles.
35
110
45
86
35
54
40
45
Right triangle
Acute triangle
Obtuse triangle
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Classifying Triangles By Sides
An isosceles triangle has 2 sides of equal
length.
An equilateral triangle has 3 sides of equal
length.
A scalene triangle has no 3 sides of equal length.
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Classifying By Sides Cont.
Classify the triangle by its sides.
5 in
4 ft
5 in
3 ft
5 in
2 ft
Scalene triangle
Equilateral triangle
Isosceles triangle
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Angles of a Triangle
The sum of the angle measures of any triangle
equals 180.
70
x
80
Find the value of x.
70 80 x 180
150 x 180
X 30
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Your Turn!
Classify the following triangles by its angles.
80
100
25
50
30
75
Acute triangle
Obtuse triangle
Right triangle
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Your Turn Continued.
Classify the triangle by its sides.
4 ft
4 ft
6 ft
Isosceles triangle
Equilateral triangle
Scalene triangle