Right Angle, two lines that create a 90 degree angle. They interesect perpendicularly., Perpendicular Lines, Lines that intersect in such a way that they form a 90 degree angle., Complementary Angles, angles whose sum is 90 degrees., Supplementary Angles, angles whose sum is 180 degrees., Parallel, Lines that never intersect as they flow in the same direction., Vertex, the point where two lines intersect forming an angle, Conjecture, make a mathematical statement using inferences., Adjacent Angles, angles next to each other., Vertical Angles, Angles opposite each other. They are congruent., Alternating Interior Angles, angles inside the parallel lines and across the transversal.They are congruent., Same Side Interior Angles, angles inside the parallel; they are supplementary., Corresponding Angles, Angles in the same position in relationship to the transversal., Exterior Angle Theorem, Every exterior angle of a triangle is congruent to the sum of the interior angles opposite the exterior angle.

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