emilymt06
emilymt06 emilymt06
  • 14-05-2022
  • Mathematics
contestada

please help with this

please help with this class=

Respuesta :

jeremiahkevinm
jeremiahkevinm jeremiahkevinm
  • 14-05-2022

Answer:

F = 53.1°

Step-by-step explanation:

When you consider F as your angle

cos F = adjacent / hypotaneous

or, cos F = EF/DF

We do not have DF right now,

so DF² = DE² + EF²

DF = √ (12² + 9²)

DF = 15

cos F = adjacent / hypotaneous

or, cos F = EF/DF

cos F = 9 / 15

F = cos ⁻¹ (9/15)

F = 53.1°

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