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|AB| = √(3 - 7)² + (6 - 3)² = √16 + 9 = 5
|BC| = √(-3 - 3)² + (-2 - 6)²) = √36 + 64 = √100 = 10
|CA| = √(7 + 3)² + (3 + 2)² = √100 + 25 = √125 = 5√5
Ob = 5 + 10 + 5√5 = 5 (1 + 2 + √5) = 5 (3 + √5) [j]