по т. косинусов:
a²=b²+c²-2*c*b*CosA
a²=27.4²+16.3²-2*27.4*16.3*Cos70
a²=750.76+265.69-893.24*0.3420
a²=1016.45-305.48808
a=√710.96192
a≈26.7
по т. косинусов:
a²=b²+c²-2*c*b*CosA
a²=27.4²+16.3²-2*27.4*16.3*Cos70
a²=750.76+265.69-893.24*0.3420
a²=1016.45-305.48808
a=√710.96192
a≈26.7