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In △ABC,a=11 , b=20 , and c=28 . Find m∠A .

In △ABC,a=11 , b=20 , and c=28 . Find m∠A .
asked 86.2k views
1 vote
In △ABC,a=11 , b=20 , and c=28 . Find m∠A .

asked
User Rits
by
8.8k points

2 Answers

4 votes

Answer:18.4

Explanation:

answered
User Richard Medeiros
by
8.0k points
4 votes

Answer:

18.4°

Explanation:

Use law of cosine.

a² = b² + c² − 2bc cos A

11² = 20² + 28² − 2(20)(28) cos A

121 = 1184 − 1120 cos A

cos A = 0.949

A = 18.4°

answered
User Marcin Olichwirowicz
by
8.1k points
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