cos(B)=CB/AB
AB=CB/cos(B)
AB=10:(5/13)=130/5=26
BC=10
cos B=5/13
cos B=BC/AB
5/13=10/AB
AB=10*13/5=26
Otvet:gipotenuza AB=26cm
cos(B)=CB/AB
AB=CB/cos(B)
AB=10:(5/13)=130/5=26
BC=10
cos B=5/13
cos B=BC/AB
5/13=10/AB
AB=10*13/5=26
Otvet:gipotenuza AB=26cm