alternate

exterior angles

When parallel lines are crossed by a transversal, we are the pair of angles on opposite sides of the transversal, but outside the parallel lines.

alternate

interior angles

When parallel lines are crossed by a transversal, we are the pair of angles on opposite sides of the transversal, but inside the parallel lines.

We are the sides on congruent (same size & shape) or similar (same shape) figures that match.

equilateral triangle

I am a triangle whose sides are all the same length and whose angles are all 60^O.

isosceles triangle

I am a triangle with both two equal sides and two equal angles.

scalene triangle

I am a triangle with three unequal sides.

skew lines

We are two or more nonparallel lines in space (3-D) that do no intersect.

vertical angles

We are the angles opposite one another at the intersection of two lines.

transversal

I am a line that intersects two parallel lines to form eight angles.

complimentary angles

We are two angles that add up to 90⁰ (a right angle). 

supplementary

angles

We are two angles that add up to 180⁰ .

adjacent angles

We are two angles that share a common side and a common vertex.

parallel lines

We are two lines on a plane

(2-D) that never meet.  We are always the same distance apart.

perpendicular lines

We are two lines that intersect to form a 90⁰ angle.

corresponding angles

We are the angles in matching corners, formed when two lines are crossed by a transversal.

congruent angles

We are angles with the same measure in degrees.