Question

os vertices de um triangulo sao, pontosP=(1,-1,0), Q=(-2,-2,4), R=(3, -1,-2). Caucule a medida de cada lado deste triangulo e seu perimetro

Answer 1

Boa noite 

P(1,-1,0), Q(-2,-2,4), R(3, -1,-2)

PQ = P - Q = (-3, -1, 4)
PR = P - R = (2, 0, -2)
QR = Q - R = (5, 1, -6)

lPQl² = 3² + 1² + 4² = 9 + 1 + 16 = 28
lPRl² = 2² + 0² + 2² = 4 + 4 = 8
lQRl² = 5² + 1² + 6² = 25 + 1 + 36 = 62

PQ = √26
PR = √8
QR = √62

perimetro
P = √26 + √8 + √62