Respuesta :

Answer:

Step-by-step explanation:

using sin formula

let third angle=α

[tex]\frac{sin~\alpha }{7.9} =\frac{sin 18}{8.4} \\sin \alpha=\frac{7.9}{8.4} \times sin~18\\\alpha=sin^{-1} (\frac{7.9}{8.4} \times sin18)\\\approx 16 ^\circ 54'\\\theta=180-(18+16^\circ 54')\\=180-34^\circ54'\\=145^\circ 06'[/tex]

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