1)cos²B + sin²B = 1
sin²B = 1 - cos²B = 1 - 1/25 = 24/25
sin B = 2✓6/5
2)sin B = AC/AB
AC = AB • sin B = 2✓6/5 • 20 = 8✓6
1. Угол B =
2.
3.
sin(alpha) = AC/AB
AC = sin(alpha) *AB
AC = 0.4*sqrt(6)*20=8*sqrt(6)
1)cos²B + sin²B = 1
sin²B = 1 - cos²B = 1 - 1/25 = 24/25
sin B = 2✓6/5
2)sin B = AC/AB
AC = AB • sin B = 2✓6/5 • 20 = 8✓6
1. Угол B =
2.
3.
sin(alpha) = AC/AB
AC = sin(alpha) *AB
AC = 0.4*sqrt(6)*20=8*sqrt(6)