Yayainous4750 Yayainous4750
  • 12-02-2022
  • Mathematics
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Find the unknown side lengths and angle measures.
Round the lengths to the nearest tenth and the angle measures to the nearest degree.

Find the unknown side lengths and angle measures Round the lengths to the nearest tenth and the angle measures to the nearest degree class=

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xenia168
xenia168 xenia168
  • 12-02-2022

Answer:

Step-by-step explanation:

m∠D = 90° - 51° = 39°

sin E = [tex]\frac{DE}{DF}[/tex] ⇒ DE = DF × sin E

DE = 18 sin51° ≈ 14.0 ft.

cos E = [tex]\frac{EF}{DF}[/tex] ⇒ EF = DF × cos E

EF = 18 × cos51° ≈ 11.3 ft.

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