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Bioffe · Answer 1 · 2022-02-26T03:54:49+0000

Answer:

Explanation:

According to the figure, cos Ф = 16/20 = 4/5 = 0.80.

Using the inverse cosine function on a calculator, we get

Ф = 0.644 radians or 36.87 degrees or arccos 4/5