Exercitiul 4:m(BOC)=m(AOD)-[m(AOB)+m(COD)]=
=90-25+35=
=90-60=30(grade)
Exercitiul 6:a)Supl. :180(grade)-125(grd)46(min.)
=179(grd)60(min.)-125(grd)46(min)
=54(grd)14(min)(SUPLEMENTUL)
b)Compl. :90(grd)-67(grd)45(min)
=89(grd)60(min)-67(grd)45(min)
=22(grd)15(min)