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4.1.notebook
November 03, 2014
Classifying Triangles by Sides
Scalene
No congruent sides
Isosceles
Equilateral
At least 2 congruent sides
3 congruent sides
Isosceles
Scalene
3
10
Equilateral
9
6
8
5
4
7
2
1
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November 03, 2014
Classifying Triangles by Angles
Acute
3 acute angles
Right
1 right angle
Obtuse
1 obtuse angle
Equiangular 3 congruent angles
Acute
9
Right
Obtuse
3
4
5
1
Equilangular
8
10
6
7
2
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November 03, 2014
Classify the triangle by its sides. Then, determine if it is a right triangle.
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November 03, 2014
Interior Angles and Exterior Angles
Triangle Sum Theorem:
The sum of the measures of the interior angles of a triangle is 180o
Proof: tear off the angles
4.1.notebook
November 03, 2014
Exterior Angle Theorem:
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.
A
B
1
C
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November 03, 2014
J
70
x
2x­5
K
L
Find the measure of angle JKM
Solve for x
2x
x
M
4.1.notebook
November 03, 2014
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