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SUPPLEMENTARY ANGLES. 2-Angles that add up to 180 degrees. COMPLEMENTARY ANGLES. 2-Angles that add up to 90 degrees. VERTICAL ANGLES. VERTICAL ANGLES ARE CONGRUENT <4=<2 AND <1=<3. PARALLEL LINES. <1=<5 Corresp .<s <3=<6 Alt. int. <s <3=<7 Corresp . <s <4=<5 Alt. int. <s
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<1=<5 Corresp.<s <3=<6 Alt. int. <s <3=<7 Corresp. <s <4=<5 Alt. int. <s <2=<6 Corresp.<s <2=<7 Alt. Ext. <s <4=<8 Corresp.<s <1=<8 Alt. Ext. <s <3 + <5= 180 Same side int. <s <4 + <6= 180 Same side int. <s