kelis88honey kelis88honey

15-07-2022
Mathematics

contestada

CAN SOMEONE HELP PLEASE
a = 3, b = 5, and c = 7. What is m&B° to the nearest tenth?

CAN SOMEONE HELP PLEASE a 3 b 5 and c 7 What is mampB to the nearest tenth class=

Respuesta :

Medunno13 Medunno13

16-07-2022

Answer: 38.2 degrees

Step-by-step explanation:

[tex]b^2 = a^2 + c^2 - 2ac \cos B\\\\5^2 = 3^2 + 7^2 - 2(3)(7) \cos B\\\\25 = 58-42 \cos B\\\\-42 \cos B=-33\\\\\cos B=\frac{33}{42}\\\\B \approx 38.2^{\circ}[/tex]

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