dAB = √( 5 - 2 )² +[3 - ( - 1 )]²
dAB = √3² + 4²
dAB = √25 → 5 cm
dBC = √(2 - 5 )² + ( - 1 + 1 )²
dBC = √( - 3 )²
dBC = √9 → 3 cm
dAC = √( 5 - 5 )² + [ 3 - ( - 1 )²
dAC = √( 3 + 1 )²
dAC = √16 → 4 cm
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dAB = √( 5 - 2 )² +[3 - ( - 1 )]²
dAB = √3² + 4²
dAB = √25 → 5 cm
dBC = √(2 - 5 )² + ( - 1 + 1 )²
dBC = √( - 3 )²
dBC = √9 → 3 cm
dAC = √( 5 - 5 )² + [ 3 - ( - 1 )²
dAC = √( 3 + 1 )²
dAC = √16 → 4 cm
P = 5 + 3 + 4 → 12 cm Caso as medidas estejam em cm.