Help Calculating Angle $\alpha$ in Sketch

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SUMMARY

The discussion centers on calculating the angle $\alpha$ between a red line and the horizontal axis, which is stated to be 20 degrees according to a referenced book. Participants noted that the provided sketch lacks sufficient dimensions, making it difficult to assist in the calculation. A request was made for a clearer image that includes more of the drawing to facilitate accurate assistance.

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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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  • Sin título.jpg
    Sin título.jpg
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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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