Răspuns :
AB=AD/2, AD=2AB=214 m
(AB+AD+BC+DC)/2=(107+214+107+214)/2=321
(AB+AD+BC+DC)/2=(107+214+107+214)/2=321
ab=107
ad=107x2=214
suma laturilor=214x2+107x2=642
jumatatea sumei este
642:2=321
ad=107x2=214
suma laturilor=214x2+107x2=642
jumatatea sumei este
642:2=321