What is the value of 0 in the following image

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We will determine the value of theta as follows:

$\begin{gathered} cos(\theta)=(10)/(21)\Rightarrow\theta=cos^(-1)((10)/(21)) \\ \\ \Rightarrow\theta\approx61.6 \end{gathered}$

So, the measurement of the angle is approximately 61.6°.

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