Question

A) 28km
B)84km
C)126km
D)179km
E)252km​

Answer 1

${a}^{2} = {b}^{2} + {c}^{2} \\ {140}^{2} = {112}^{2} + {c}^{2} \\ 19.600 = 12.544 + {c}^{2} \\ - {c}^{2} = 12.544 - 19.600 \\ - {c}^{2} = - 7.056 \: \: .( - 1) \\ {c}^{2} = 7.056 \\ c = \sqrt{7.056} \\ c = 84$

RESPOSTA: B) 84 KM

RESPOSTA: B) 84 KM

no caso, o y equivale a letra c da fórmula.