Geometry Vocab Flashcard

Front

What does it mean for points to be COPLANAR? Fill in the blank: Points that lie on the same ________ are coplanar.

Back

plane

Front

If ∠ABD and ∠DBC are adjacent, then ∠ABD + ∠DBC = ∠ABC. What is this property called?

Back

Angle Addition Postulate

Front

What is the definition of a POINT in geometry? Fill in the blank: A point is a location with _________.

Back

no size or shape

Front

What is a segment bisector?

Back

A segment, line, or ray that intersects a segment at its midpoint.

Front

What are parallel lines?

Back

Two lines that never intersect. Symbol: ||

Front

What is the definition of a LINE in geometry? Fill in the blank: A line is a straight path that extends in both directions without _________.

Back

end.

Front

What is a RAY in geometry? Fill in the blank: A ray is a part of a line that has one endpoint and extends _________.

Back

infinitely in one direction.

Front

What is the definition of an ANGLE? Fill in the blank: An angle is formed by two rays that share a common _________.

Back

endpoint.

Front

What is the difference between acute, right, and obtuse angles?

Back

Acute angles are less than 90°, right angles are exactly 90°, and obtuse angles are greater than 90°.

Front

What is a transversal?

Back

A line that intersects two or more lines at different points.