What angle should replace the green question mark sign in
Is it $10$ deg $+$ $15$ deg $= 25$ deg?
The third angle in the triangle is $\theta = 180 - (10 + 15)$. The green angle is supplementary to $\theta$ and so would be $180 - \theta = 25$.
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The third angle in the triangle is $\theta = 180 - (10 + 15)$. The green angle is supplementary to $\theta$ and so would be $180 - \theta = 25$.