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26-02-2020
Mathematics

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In △CDE , DE=10 , CE=5 , and m∠E=58∘ .

What is the length of CD¯¯¯¯¯ ?

Enter your answer, rounded to the nearest hundredth, in the box.

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amna04352 amna04352

26-02-2020

Answer:

8.49 units

Step-by-step explanation:

CD is the length opposite angel E

Use cosine law

CD² = 10² + 5² - 2(10)(5)cos(58)

CD² = 72.00807358

CD = 8.485757101

CD = 8.49 units

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