What is the sum of the interior angles of a triangle?
3.1 Sum of Interior Angles of a Triangle

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Mathematics
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The sum of the interior angles of a triangle is always 180 degrees.
2.
FLASHCARD QUESTION
Front
If two angles of a triangle are 70° and 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 acute angle?
Back
An acute angle is an angle that measures less than 90 degrees.
4.
FLASHCARD QUESTION
Front
What is a right angle?
Back
A right angle is an angle that measures exactly 90 degrees.
5.
FLASHCARD QUESTION
Front
What is an obtuse angle?
Back
An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.
6.
FLASHCARD QUESTION
Front
How do you find the measure of a missing angle in a triangle?
Back
To find the missing angle, subtract the sum of the known angles from 180 degrees.
7.
FLASHCARD QUESTION
Front
If one angle of a triangle is 90° and another is 30°, what is the measure of the third angle?
Back
The third angle is 60° (180° - 90° - 30° = 60°).
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