Question

use a lei dos senos para determinar quantos km tem a rodovia bc

Answer 1

$\frac{x}{Sen x} = \frac{y}{Sen y};\frac{BC}{ \frac{3}{4} } = \frac{40}{ \frac{3}{7} } ;\frac{3BC}{7} = 30;3BC = 210; BC = \frac{210}{3} ; BC=70$