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/sci/ - Science & Math

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>> No.3209450 [View]
File: 50 KB, 607x610, plz-halp.jpg [View same] [iqdb] [saucenao] [google]
3209450

I'm studying and my brain is turned off today. I'd love someone to explain how it's established that the marked angle is 2α.

In the picture the black box is the question, and lower half is the solution.

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