How do you find angle measurements in this triangle?
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Transcript of How do you find angle measurements in this triangle?
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How do you find angle measurements in this
triangle?
90
(4x + 7)
(8x - 1) 3x
2x -5
x + 11
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In this lesson you will learn how to find the measure of an angle in a triangle by using the
other two angles.
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Let’s ReviewLet’s Review
3
21
1
2
3
180
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Let’s ReviewLet’s Review
x + 11 + 2x - 5 + 3x
3x + 2x + x + 11 -5
6x + 6
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Let’s ReviewA Common Mistake
angle 1 + angle 2 + angle 3 90
1
23
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Let’s ReviewCore Lesson
65
47
x
a
cb
47 + 65 + x = 180112 + x = 180
x = 68angle b = 680
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Let’s ReviewCore Lesson
X + 11 + 2x - 5 + 3x = 1806x + 6 =180
6x = 174x = 29
(3x)
(2x -5)
(x + 11)c
b
a
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Let’s ReviewCore Lesson
(3x)
(2x -5)
(x + 11)c
b
a
Angle a = x + 11
Angle a = 29 + 11
Angle a = 400
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In this lesson you have learned how to find the measure of an angle in a triangle by using the
other two angles.
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Let’s ReviewGuided Practice
Find the measurement of angle m.
(8x + 2)
(4x) (2x + 10)
m
o
n
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Let’s ReviewExtension Activities
Find the measure of angle b by solving for x
65
80
x
a
cb
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Let’s ReviewExtension ActivitiesFind the measure of angle c
(3x)
(2x – 11)
(2x + 27)
c
b
a
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Let’s ReviewExtension Activities
Angle b is three times the measure of angle a. Angle c is two times the measure of angle a. What are the measures of all the angles in triangle abc?
ac
b
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Let’s ReviewQuick Quiz
Triangle ABC has angle that measure 78⁰ and 270
. What is the measure of the third angle?
Determine all three angle measurements in Triangle XYZ that has angles that measure (2x – 15)0, (x – 5)0 and 420.