Respuesta :

mhanifa

Answer:

  • 74°

Step-by-step explanation:

Given  ΔABC with:

  • a = 1.9 in, b = 7.1 in, c=7.4 in

To find

  • ∠B

Solution

Use the law of cosines

  • cos B = (a² + c² - b²)/(2ac)
  • cos B = (1.9² + 7.4² - 7.1²)/(2*1.9*7.4)
  • cos B = 0.283
  • m∠B = accos (0.283)
  • m∠B = 74° (rounded)

ThailerHMcGalliard

Answer:

74 is correct in Delta Math

Step-by-step explanation: