parallel lines and triangles

Question 1

What is postulate 3-2?

Answer 1

“Through a point not on a line, there is one and only one line parallel to the given line.”

Question 2

What is theorem 3-11?

Answer 2

“The sum of the measures of the angles of a triangle is 180”

Question 3

What is an exterior angle of a polygon?

Answer 3

“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”

Question 4

What is theorem 3-12?

Answer 4

“The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles”

Question 5

What is an auxiliary line?

Answer 5

“An auxiliary line is a line that you add to a diagram to help explain relationships in proofs”