What is the red angle if the green and blue angles are known and the yellow angles are equal in the following image?

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What is the red angle if the green and blue angles are known and the yellow angles are equal in the following image:

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Edit: What's the formula for figuring out the red angle?

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Let $R,G,B,Y$ be red, green, blue, yellow respectively. Then

$$R+\pi = B+Y, \quad B = Y + G.$$

Rearrange to represent $R$ in $B$ and $G$ only.