Find cos B exactly if a = 15, b = 11, and angle Cis a right angle
Mathematics · Middle School · Tue Nov 03 2020
llm
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Given: The triangle ABC is right angled at C. length of side a is 15 units, the length of side b is 11 units.
We have to find the cosine value of angle B.
By phythogoras theorem,
H² = P² + B²
H² = 11² + 15²
H² = 221 + 225
H² = 346
H = √346
Now, we know cos = B/H
Cos B = 15/√346