37 . < EGA + <EGC = 90 degree , as CD is perpendicular to AG
67 + <EGC = 90
<EGC = 90 - 67 = 23 degree
39. < DGB + < DGA = 180 degrees , linear pair
< DGB + 90 = 180 ,as CD is perpendicular to AG
< DGB = 180 - 90 = 90 degree
41. < UKV & <VKW are complements
as UK is perpendicular to ZW
<UKV + < VKW = 90 , so complements angle as their sum is 90 degree
<YKZ and <XKY are complements
<YKZ + < XKY = 90 , so complements angle as their sum is 180 degree
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