Lines that have opposite reciprocal slopes and intersect at a 90 degrees angle.
100
What is an Acute Angle?
An angle measuring between 0 and 90 degrees.
100
What is an Angle Bisector.
A line or ray that divides an angle into two congruent parts.
100
What are Corresponding Angles?
Angles on the same side of the transversal in same spot on the two parallel lines.
100
What is a Point?
a location
200
What are Parallel Lines?
Lines with the same slope.
200
What are Obtuse Angles?
Angles that measure between 90 and 180 degrees.
200
What are Complementary Angles?
Two angles that add up to 90 degrees.
200
What are Interior Angles?
Angles that lie in-between the two parallel lines.
200
What is a Ray?
A part of a line that starts at the endpoint and continues forever in one direction.
300
What is a Line?
An undefined term that continues forever in both directions
300
What is an Angle?
A figure with two rays which intersect at a common endpoint.
300
What are Supplementary Angles?
Two angles that add up to 180 degrees.
300
What are Exterior Angles?
Angles that don't lie in between the two parallel lines.
300
What is a Midpoint?
A point that divides a line segment into two congruent parts.
400
What is a Line Segment?
A part of a line with two endpoints.
400
What is a Right Angle?
An angle that measures 90 degrees.
400
What are Vertical Angles?
Angles that are non-adjacent,non-overlapping angles and formed by two intersecting lines.
400
What are Alternate Interior Angles?
A pair of angles that are non-adjacent, lie on opposite sides of the transversal and are in-between the two parallel lines that the transversal intersects.
400
What are Same-Side Interior Angles?
Angles on the same side of the transversal and between the parallel lines.
500
What is a Linear Pair?
Angles that are supplementary and share a side.
500
What is a Straight Angle?
Angle that measures exactly 180 degrees.
500
What is a Transversal?
A line that intersects two or more other lines at different points.
500
What are Alternate Exterior Angles?
A pair of angles that are non-adjacent, lie on opposite sides of the transversal and are outside the two parallel lines that the transversal intersects.