3 years ago

Find the unknown side lengths and angle measures.

Mathematics

1 answer:

seropon [69]3 years ago

6 0

Answer:

Step-by-step explanation:

m∠D = 90° - 51° = 39°

sin E = $\frac{DE}{DF}$ ⇒ DE = DF × sin E

DE = 18 sin51° ≈ 14.0 ft.

cos E = $\frac{EF}{DF}$ ⇒ EF = DF × cos E

EF = 18 × cos51° ≈ 11.3 ft.

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