Find cos b exactly if a = 15, b = 11, and angle c is a right triangle choices; a) 15/11 b) 11/15 c) sqrt346/15 d) 15/sqrt346

Pythagorean theorem can be used for evaluating the one unknown side in a right angled triangle. The value of cosine B is .

Given the length of side a is 15 units, the length of side b is 11 units and the triangle ABC is right angled at C.

Question is asked to find the cosine value of angle B.

Therefore, according to the questions.

Base is 15 units

Perpendicular is 11 units.

Now, apply the Pythagoras theorem, and solve it further.

Thus,

The value of cosine B is .

To know more about Pythagoras, please refer to the link:

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