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2014-08-20T09:10:58+03:00
ABCD-trapez dreptunghic
mas<A=mas<D=90
mas<C=mas<B +38

mas<A + mas<D + mas<C + mas<B=360

90+90+mas<B+38+mas<B=360

2mas<B+38=360-180

2mas<B+38=180

2mas<B=180-38

2mas<B= 142

mas<B=71

mas<C=71+38

mas<C=109
3 3 3