4.2

Question 1

Interior Angle

Answer 1

Angles formed by the sides of a figure, located in the interior of the figure.

Question 2

Exterior Angle

Answer 2

An angle that is adjacent to an interior angle (must form a linear pair) or… an angle that forms a linear pair with an interior angle.

Question 3

Thm. 4.2: Triangle Sum Theorem

Answer 3

The sum of the measures of the interior angles of a triangle is 180 degrees.

Question 4

Thm. 4.3: Third Angles Theorem

Answer 4

If two angles of one triangle are congruent to two angles of a second triangle, then the third angles are also congruent.

Question 5

Thm. 4.4

Answer 5

The acute angles of a right triangle are complementary.

Question 6

Thm. 4.5: Exterior Angle Theorem

Answer 6

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.

Question 7

Thm. 4.6: Exterior Angles Inequality Theorem

Answer 7

The measure of an exterior angle of a triangle is greater than the measure of either of the two nonadjacent interior angles.