Geometry: Parallel and Perpendicular Lines

Define corresponding angles.

• Pairs of angles that are in similar positions at each intersection where a straight line crosses two others.

• Angles that are equal in measure regardless of their position.

• Angles that are supplementary to each other at a point of intersection.

• Angles that are adjacent to each other on the same line.

What is the sum of the interior angles of a triangle?

• 90 degrees

• 180 degrees

• 360 degrees

• 120 degrees

What are the conditions for two lines to be parallel in terms of their slopes?

• Two lines are parallel if they have the same slope.

• Two lines are parallel if they intersect at a right angle.

• Two lines are parallel if their slopes are negative reciprocals.

• Two lines are parallel if they have different slopes.

What are perpendicular lines?

• Lines that intersect at a right angle (90 degrees).

• Lines that run parallel to each other.

• Lines that meet at an acute angle.

• Lines that are equidistant from each other.

What is the slope of a vertical line?

• 0

• 1

• undefined

• infinity

What is the slope of a horizontal line?

• 0

• 1

• -1

• Undefined

If two parallel lines are cut by a transversal, what can be said about the corresponding angles?

• The corresponding angles are equal.

• The corresponding angles are supplementary.

• The corresponding angles are complementary.

• The corresponding angles are unequal.

Identify a pair of alternate exterior angles when two parallel lines are cut by a transversal.

• ∠1 and ∠8

• ∠2 and ∠3

• ∠4 and ∠5

• ∠6 and ∠7

What is the relationship between alternate interior angles when two parallel lines are cut by a transversal?

• Alternate interior angles are equal.

• Alternate interior angles are supplementary.

• Alternate interior angles are complementary.

• Alternate interior angles are unequal.

What are parallel lines?

• Lines that intersect at a right angle.

• Lines that never meet and are always the same distance apart.

• Lines that converge at a point.

• Lines that have different slopes.