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B (12,0) -> X2 = 12 , Y2 = 0
AB² = (X2 - X1)² + (Y2 - Y1)²
AB² = (12 - (-4))² + (0-12)²
AB² = 16² + (-12)²
AB² = 256 + 144
AB² = 400
AB = √400
AB = 20