Geometry Vocabulary Descriptions

Match the following

• Obtuse Angle

• Straight Angle

• Right Angle

• Acute Angle

Match the following

• Vertex Angle

• Any 2 non-overlapping angles with the same vertex and side.

• Adjacent Angles

• Two angles that share a common side and common vertex.

• Complementary Angles

• Two Angles with a sum of 90 degrees.

• Supplementary Angles

• Two Angles with a sum of 180 degrees.

Match the following

• Line

• A part of a line that has one endpoint and goes on infinitely in one direction.

• Plane

• The figure formed by two rays with a common endpoint.

• Ray

• A part of a line that consists of two endpoints and all points in between.

• Angle

• A flat surface with infinite length and width, no thinkness.

• Segment

• An infinite set of points forming a straight path in both directions.

A unit of angle measure is a__________.

Match the following

• Postulate

• A point B, which lies between point A and C if AB+AC=AC

• Segment Addition Postulate

• A statement that is accepted as true.

• Angle Addition Postulate

• Angle measures can be added if angles do not overlap.

Match the following

• Midpoint

• A ray that separates an angle into two congruent angles.

• Collinear

• On the same line.

• Coplanar

• Occurring in the same plane.

• Congruent

• Having the same size and shape.

• Angle Bisector

• The point on a line segment that divides it into two congruent segments.

Match the following

• Parallel Lines

• to meet or cross

• Perpendicular Lines

• absolute value of the difference of two coordinates

• distance

• Intersecting lines forming right angles.

• skew

• Non coplanar lines that do not intersect.

• intersection

• Two lines in the same plane that never intersect.

Rate your confidence with these terms.

• 1 Not very strong.

• 2-3 Halfway there or better.

• 4 Really Strong

• 5 Impecable