caritherskiana caritherskiana

25-01-2018
Mathematics

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Find angle D. Round the answer to the nearest tenth.

Find angle D Round the answer to the nearest tenth class=

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sqdancefan sqdancefan

07-07-2018

The Law of Cosines is useful for this.
d² = e² + f² - 2ef·cos(D)
cos(D) = (e² + f² - d²)/(2ef) = (1.8² + 3.1² - 2²)/(2·1.8·3.1)
D = arccos(8.85/11.16)
D ≈ 37.5°

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