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Ilya [14]
2 years ago
12

Can someone explain this to me please?

Mathematics
1 answer:
Alex Ar [27]2 years ago
4 0

Answer:

Option C

Step-by-step explanation:

Since, measure of all sides of the triangle has been given in the picture,

By applying cosine rule in the given triangle,

AC² = AB² + BC² - 2(AB)(BC)cos(B)

11² = 16² + 16² - 2(16)(16)cos(B)

121 = 256 + 256 - 512.cos(B)

121 - 512 = - 512.cos(B)

cos(B) = \frac{391}{512} = 0.763672

B = cos^{-1}(0.763672)

B = 40.2°

Therefore, measure of angle B is 40.2°.

Option C is the answer.

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