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vaieri [72.5K]
3 years ago
10

Calculate cos theta to two decimal places

Mathematics
1 answer:
Ghella [55]3 years ago
4 0

Answer:

B. 0.72

Step-by-step explanation:

In order to find the answer we need to use the following formula:

a^2=b^2+c^2-2bc*cos(\theta) where:

a, b, c are the length of the sides and \theta the angle, so:

7^2=10^2+8^2-(2*10*8)*cos(\theta)

49=164-(160)*cos(\theta)

cos(\theta)=0.71875

In conclusion, cos(\theta)=0.72, so the answer is B.

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