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WILL GIVE BRAINLIEST!! ABC is a triangle. Find the size of the largest angle in the triangle. Give your answer in degrees correct to 3 significant figures.

WILL GIVE BRAINLIEST ABC is a triangle Find the size of the largest angle in the triangle Give your answer in degrees correct to 3 significant figures class=

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mhanifa

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.

Work out the angle measure using the law of cosines:

  • 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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