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 the interior angles of a triangle is always 180°.
2.
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°).
3.
FLASHCARD QUESTION
Front
What is an interior angle of a triangle?
Back
An interior angle is an angle formed inside a triangle by two sides.
4.
FLASHCARD QUESTION
Front
What is an exterior angle of a triangle?
Back
An exterior angle is formed by one side of a triangle and the extension of an adjacent side.
5.
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.
6.
FLASHCARD QUESTION
Front
If one angle of a triangle is 40° and the exterior angle is 120°, what is the measure of the other interior angle?
Back
The other interior angle is 60° (120° - 40° = 80°, and 180° - 80° = 100°).
7.
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.
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