Geometry

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is an angle?

Back

A figure formed by two rays that share a common endpoint.

Front

What is a line?

Back

A straight path of points that goes on and on in two directions.

Front

What are perpendicular lines?

Back

Lines that intersect to form square corners (90 degrees).

Front

What is a plane?

Back

An endless flat surface that extends in all directions.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures greater than 90 degrees but less than 180 degrees.

Front

What are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

What is a vertex?

Back

The point where two rays meet to form an angle.

Front

What is a triangle?

Back

A polygon with three sides and three angles.