
ա) A (2 ; 7)
B (-2 ; 7)
AB = √(2+2)2 + 02=4
բ) A (-5 ; 1)
B (-5 ; -7)
AB = √02 + 82 = 8

M (4 ; 0)
N (12 ; -2)
P (5 ; -9)

AB = √(4 — 12)2 + 22 = √68
BC = √(2 — 5)2 + (-2 + 9)2 = √98
CA = √(5 — 4)2 + (9 — 0)2 =√9

A ( 2 ; 3)
B (x ; 1)
AB = √(2 — x)2 + (3-7)2 = 2
√(2 — x)2 + 4 =2