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AB = CD = EF = 20 cm
AC = CE = GE = 29 cm
FG =?
FG^2= GE^2 - EF^2
FG^2= 29^2 - 20^2
FG^2= 841 - 400
FG^2= 441
FG=21 cm
jawabannya B
jadi jawabannya B.21