А)ВС= С(0;5)-В(-2;10) = (2;-5)
б)|AC| = ((6-0)^2+(-4-5)^2)^(1/2)=(36+81)^(1/2)=3√13
в)M=(А+С)/2=(3;1/2)
г)P = |AC|+|ВC|+|AВ|
|ВC| = ((-2-0)^2+(10-5)^2)^(1/2) = (4+25)^(1/2) = √29
|AВ|= ((6+2)^2+(-4-10)^2)^(1/2) = (64+196)^(1/2) = 2√65
P = 3√13+√29+2√65
д)
|BM|=((-2-3)^2+(10-1/2)^2)^(1/2) = √461/2