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MATH SOLVE
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Calculate cos theta to two decimal places. A. 0.69B. 1.38C. -0.07D. 0.77
4 months ago
Q:
Calculate cos theta to two decimal places. A. 0.69B. 1.38C. -0.07D. 0.77
Accepted Solution
A:
Answer:A. 0.69Step-by-step explanation:We need to use cosine theorem: c²=a²+b² - 2ab* cos(θ)c=8, a=7, b=118² = 7²+11² - 2*7*11 *cos(θ)64 = 49 + 121 - 154*cos(θ)64 - 170 = - 154*cos(θ)- 106/ (- 154) = cos(θ)cos(θ) = 0.69