in the world around us

An angle whose measure is greater than 0 degrees and less than 90 degrees.

An angle whose measure is greater than 90 degrees and less than 180 degrees.

An angle with a measure of 90 degrees.

A pair of angles that share a side or ray.

A pair of congruent angles that are non-adjacent and share a vertex.

A line that intersects or cuts a pair of parallel lines.