Geometry Vocabulary

Front

What is a pentagon?

Back

A five-sided polygon.

Front

What is a midsegment in a triangle?

Back

A segment connecting the midpoints of two sides of a triangle.

Front

What is an angle whose measure is 90° called?

Back

Right angle.

Front

What is an angle bisector?

Back

A line that divides an angle into two equal parts.

Front

What is a perpendicular bisector?

Back

A line that is perpendicular to a segment at its midpoint.

Front

What is a median in a triangle?

Back

A segment from a vertex to the midpoint of the opposite side.

Front

What is an altitude in a triangle?

Back

A segment from a vertex perpendicular to the opposite side.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines cut by a transversal.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines.

Front

What are same side interior angles?

Back

Two angles formed by two lines and a transversal on the same side of the transversal.