1. -(2; -2) + 1/3 * (-3; 6) = (-2; 2) + (-1; 2) = (-3; 4)
2. AB = √(64 + 4) = √68 = 2√17
BC = √(4 + 64) = √68 = 2√17
AC = √(16 + 0) = √16 = 4
P = 2√17 + 2√17 + 4 = 4√17 + 4
M = ((3+1)/2; (6-2)/2) = (2; 2)
CM = √(9 + 16) = √25 = 5
Ответ: P = 4(√17 + 1); CM = 5
3. Уравнение:
(x - x0)² + (y - y0)² = r²
(x + 1)² + (y - 2)² = 4 - ответ