# This problem refers to triangle ABC.If a39 cm, b = 15 cm, and c = 30 cm, find the largest angle. (Round your answer to the nearest whole number.)

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Photo attached help_outlineImage TranscriptioncloseThis problem refers to triangle ABC. If a 39 cm, b = 15 cm, and c = 30 cm, find the largest angle. (Round your answer to the nearest whole number.) fullscreen
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Step 1

Let’s first draw the given triangle ABC for better understanding. Here a = 39,

b = 15 and c = 30.

Step 2

Using Cosine rule for a trian... help_outlineImage Transcriptioncloseb2 c2 a2 152 302 392 -0.44 cos A 2 15 30 2bc cos (-0.44) = 116.104° 116° А: => a2c2b2 392 302 152 0.9385 COS B 2ас 2 39 30 20 B cos-(0.9385) = 20.205 => a2b2 c2 392152 392 0.7231 COS C 2 39 15 2ab C = cos-1(0.7231) = 43.691° 44 => fullscreen

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### Trigonometry 