What is the Triangle Sum Theorem?
Interior and Exterior Angles of Triangles

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Mathematics
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The Triangle Sum Theorem states that the sum of all interior angles in a triangle is 180°.
2.
FLASHCARD QUESTION
Front
What is an interior angle of a triangle?
Back
An interior angle of a triangle is an angle formed by two sides of the triangle that is located inside the triangle.
3.
FLASHCARD QUESTION
Front
What is an exterior angle of a triangle?
Back
An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side.
4.
FLASHCARD QUESTION
Front
How do you calculate an exterior angle of a triangle?
Back
An exterior angle is equal to the sum of the two opposite interior angles.
5.
FLASHCARD QUESTION
Front
If one angle of a triangle is 70° and another is 60°, what is the measure of the third angle?
Back
The third angle is 50° (180° - 70° - 60° = 50°).
6.
FLASHCARD QUESTION
Front
What is the relationship between interior and exterior angles?
Back
The exterior angle is equal to the sum of the two non-adjacent interior angles.
7.
FLASHCARD QUESTION
Front
If the exterior angle of a triangle is 120°, what are the measures of the two non-adjacent interior angles?
Back
The sum of the two non-adjacent interior angles is 120°.
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