17. a = 110° , b = 110°
18. a = 85° , b = 95°
19. a = 115° , b = 115°
20. a = 65° , b = 65°
21. a = 65° , b = 115°
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Answers & Comments
17. a = 110° , b = 110°
18. a = 85° , b = 95°
19. a = 115° , b = 115°
20. a = 65° , b = 65°
21. a = 65° , b = 115°