cos A = AC/AB = 2/3
Треугольники ABC и ACH подобны, следовательно:
AH/AC = AC/BC
AH/AC = 2/3, AC = 3AH/2 = 3*12/2 = 18
AC/AB = 2/3, AB = 3AC/2 = 3*18/2 = 27
cos A = AC/AB = 2/3
Треугольники ABC и ACH подобны, следовательно:
AH/AC = AC/BC
AH/AC = 2/3, AC = 3AH/2 = 3*12/2 = 18
AC/AB = 2/3, AB = 3AC/2 = 3*18/2 = 27