parallel lines and triangles Flashcards
1
Q
What is postulate 3-2?
A
“Through a point not on a line, there is one and only one line parallel to the given line.”
2
Q
What is theorem 3-11?
A
“The sum of the measures of the angles of a triangle is 180”
3
Q
What is an exterior angle of a polygon?
A
“An angle formed by a side and an extension of an
adjacent side”
- “For each exterior angle of a triangle, the two nonadjacent interior angles
are its remote interior angles”
4
Q
What is theorem 3-12?
A
“The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles”
5
Q
What is an auxiliary line?
A
“An auxiliary line is a line that you add to a diagram to help explain relationships in proofs”
