Question

ПОМОГИТЕ УМОЛЯЮ!!!!!!!!! ​

Answer 1

1. AB = (5-2; 8-4) = (3;4)
CD = (5-(-7);8-(-1)) = (12; 9)
AB*CD = 3*12 + 4*9 = 72
2. ab = 1*(-5) + 6*7 = 37
3. ab = 4,5 * 6 * cos60 =13,5