Question

2)utilizando a tabela, calcule a medida x. vamos considerar as medidas de comprimento em cm.

ÂNGULO        SENO
  30º                 0,50
  40º                 0,64
  50º                 0,77
  60º                 0,87
  70º                 0,94

Answer 1

$a) 0,0,87=\frac{x}{20}\\x=20*0,87\\x=17,4\ cm\\\\b)0,64=\frac{x}{15}\\x=15*0,64\\x=9,6\ cm\\\\c)0,94=\frac{4,7}{x}\\0,94x=4,7\\x=\frac{4,7}{0,94}=>\frac{470}{94}\\x=5\ cm\\\\d)0,5=\frac{2,3}{x}\\0,5x=2,3\\x=\frac{2,3}{0,5}\\x=4,6\ cm$