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Elina [12.6K]
2 years ago
6

In ΔCDE, the measure of ∠E=90°, the measure of ∠D=50°, and DE = 8. 1 feet. Find the length of CD to the nearest tenth of a foot

Mathematics
1 answer:
Luden [163]2 years ago
3 0

Answer:

  12.6 ft

Step-by-step explanation:

Trig functions relate the sides and angles in a right triangle. Here, we're given an angle and an adjacent side, and we're asked to find the hypotenuse. The relevant trig relation is ...

  Cos = Adjacent/Hypotenuse

  cos(50°) = DE/CD = (8.1 ft)/CD

Solving for CD, we find ...

  CD = (8.1 ft)/cos(50°) ≈ 12.601 ft

The length of CD is about 12.6 feet.

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