What is the sum of the interior angles of a triangle?
#5.1 Angles of Triangles

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Mathematics
•
9th - 11th 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
Define an equilateral triangle.
Back
An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are equal, each measuring 60 degrees.
3.
FLASHCARD QUESTION
Front
What is an isosceles triangle?
Back
An isosceles triangle is a triangle that has at least two sides of equal length and the angles opposite those sides are equal.
4.
FLASHCARD QUESTION
Front
What is a scalene triangle?
Back
A scalene triangle is a triangle in which all three sides are of different lengths and all three angles are of different measures.
5.
FLASHCARD QUESTION
Front
What is the definition of an obtuse triangle?
Back
An obtuse triangle is a triangle that has one angle measuring more than 90 degrees.
6.
FLASHCARD QUESTION
Front
If one angle of a triangle is 60 degrees and another is 70 degrees, what is the measure of the third angle?
Back
The third angle measures 50 degrees (180 - 60 - 70 = 50).
7.
FLASHCARD QUESTION
Front
How do you find the measure of an unknown angle in a triangle?
Back
To find an unknown angle in a triangle, subtract the sum of the known angles from 180 degrees.
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