4.2 Angles of a Triangle Flashcards
0
Q
exterior angle (of a triangle)
A
angles that are adjacent to and form a linear pair with interior angles of a triangle
(each vertex has a pair of exterior angles)
1
Q
interior angle (of a triangle)
A
one of the three original angles in a triangle
2
Q
triangle sum thm
A
the sum of the measures of the interior angles of a triangle is 180 degrees
3
Q
third angles thm
A
if 2 angles of one triangle are congruent to 2 angles of another triangle, then the third angles in each triangle are congruent too
4
Q
the acute angles of a right triangle are….
A
complementary
5
Q
exterior angles thm
A
the measure of an exterior angle of a triangle is equal to the sum of the measures of the 2 remote (non-adjacent) interior angles
