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3 years ago

14

WILL GIVE BRAINLIEST!! ABC is a triangle. Find the size of the largest angle in the triangle. Give your answer in degrees correc

t to 3 significant figures.

1 answer:

zubka84 [21]3 years ago

4 0

Answer:

98.2°

Step-by-step explanation:

The largest angle is opposite to the largest side.

Since the largest side is BC, the largest angle is A.

<u>Work out the angle measure using the law of cosines:</u>

cos ∠A = (b² + c² - a²)/(2bc)
cos ∠A = (3² + 7² - 8²)/(2*3*7)
cos ∠A = -0.14286
m∠A = arccos (-0.14286)
m∠A = 98.2°

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Read 2 more answers

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