Congruent triangles  - all three sides equal. SSS 	   
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												Congruent triangles  - Why SSA does not work 	   
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												Congruent triangles  - Two sides and included angle. SAS 	   
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												Polygons are congruent when all corresponding sides and interior angles are congruent. 	   
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												Definition and properties of the inscribed angle of a circle 	   
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												Definition and properties of vertical (or opposite) angles 	   
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												Definition and properties of supplementary angles - two angles that add to 180 degrees 	   
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												Definition and properties of the interior angles of a transversal 	   
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												Definition and properties of the exterior angles of a transversal  	   
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												Definition of a straight angle. An angle that exactly 180 degrees - a straight line. 	   
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