sinB=AC/AB=40/50=0.8
cosB=CB/AB
CB=√(2500-1600)=√900=30
cosB=30/50=0.6
tgB=AC/CB=40/30=1 целая 1/3 или 1,3(3)
sinB=AC/AB=40/50=0.8
cosB=CB/AB
CB=√(2500-1600)=√900=30
cosB=30/50=0.6
tgB=AC/CB=40/30=1 целая 1/3 или 1,3(3)