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Calculate cos (theta) to two decimal places. PLS HELP ASAP

Calculate cos (theta) to two decimal places. PLS HELP ASAP-example-1
User Marinos
by
8.2k points

1 Answer

1 vote

Answer:

B. -0.07

Explanation:

Apply the Law of signs find θ.

Cos θ = (a² + b² - c²)/2ab

Where,

a = 7

b = 8

c = 11

Plug in the values

Cos θ = (7² + 8² - 11²)/2*7*8

Cos θ = (49 + 64 - 121)/112

Cos θ = -8/112

Cos θ = -0.0714285714

Cos θ = -0.07 (to 2 decimal places)

User Dpdearing
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