MHB Help Calculating Angle $\alpha$ in Sketch

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To calculate the angle $\alpha$ between the red line and the horizontal, additional dimensions and a clearer sketch are necessary. The current image is deemed insufficient for accurate calculations. The book states that the angle should be 20 degrees, but without more information, it is challenging to verify this. A request for a rescan of the drawing with more details has been made to facilitate better assistance. Providing a complete image will help in obtaining a precise calculation for angle $\alpha$.
DanielBW
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Hello everyone! I need your help with the next sketch:

View attachment 3638

I need to find the angle between the red line and the horizontal ($\alpha$). I did try everything that i could imagine but even so i couldn't find it.

According to the book, the angle should be: $\alpha=20~degrees$

How can i calculate it?
 

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I think your picture here is cut off, and you're missing too many dimensions in the drawing for us to be able to help you out here. Could you please rescan with more of the drawing in the picture?
 

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