What is the Triangle Angle Sum Theorem?
Triangle Angle Sum Theorem

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•
Mathematics
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The Triangle Angle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.
2.
FLASHCARD QUESTION
Front
If one angle of a triangle is 45 degrees and another is 90 degrees, what is the measure of the third angle?
Back
The third angle measures 45 degrees, since 180 - (45 + 90) = 45.
3.
FLASHCARD QUESTION
Front
What type of angle measures exactly 90 degrees?
Back
A right angle.
4.
FLASHCARD QUESTION
Front
If two angles in a triangle measure 62 degrees and 56 degrees, what is the measure of the third angle?
Back
The third angle measures 62 degrees, since 180 - (62 + 56) = 62.
5.
FLASHCARD QUESTION
Front
What is the measure of an angle that is complementary to a 47 degree angle?
Back
The complementary angle measures 43 degrees, since 90 - 47 = 43.
6.
FLASHCARD QUESTION
Front
What is the measure of an angle that is supplementary to a 50 degree angle?
Back
The supplementary angle measures 130 degrees, since 180 - 50 = 130.
7.
FLASHCARD QUESTION
Front
In a triangle, if one angle is obtuse, what can be said about the other two angles?
Back
The other two angles must be acute, as the sum of all angles in a triangle is 180 degrees.
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