Triangle Theorems
Presentation
•
Mathematics
•
6th Grade
•
Hard
Joseph Anderson
FREE Resource
6 Slides • 7 Questions
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Unit 11: Angles + Triangles
Lesson 2: Angles in a Triangle
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Sum of Angles in a Triangle
A triangle has 3 angles that ADD together to equal 180 degrees.
If you are given angles and they DO NOT ADD UP TO 180 degrees, then you CAN NOT make a Triangle.
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Multiple Choice
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Multiple Choice
Which Angle measurements create a Triangle?
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Multiple Choice
Which Angle measurements does NOT create a Triangle?
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Find Missing Angle
Step 1: Write as a SUM of 180
Step 2: Plug In and SOLVE
Ex: a + b + c = 180
a = 120
b = 34
120 + 34 + c = 180
154 + c = 180
c = 26 Degrees
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Multiple Choice
Find the missing angle measure of Angle T.
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Multiple Choice
Find the measure of the indicated angle.
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Angles and Sides
The smallest angle will be opposite the shortest side
While the largest angle will be opposite the longest side.
A side is congruent to another side if it has an equal length.
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Triangle Inequality
To form a triangle, the sum of any two side lengths MUST be GREATER THAN the last side length.
a + b > c
b + c > a
a + c > b
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Multiple Choice
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Multiple Choice
Unit 11: Angles + Triangles
Lesson 2: Angles in a Triangle
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