Term
alternate
exterior angles


Definition
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.



Term
alternate
interior angles


Definition
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.



Term

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



Term

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



Term

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



Term

Definition
I am a triangle with three unequal sides.



Term

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



Term

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



Term

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



Term

Definition
We are two angles that add up to 90^{0} (a right angle).



Term

Definition
We are two angles that add up to 180^{0} .



Term

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



Term

Definition
We are two lines on a plane
(2D) that never meet. We are always the same distance apart.



Term

Definition
We are two lines that intersect to form a 90^{0} angle.



Term

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



Term

Definition
We are angles with the same measure in degrees.


