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OpenStudy (anonymous):

Question in attachment, help please.

OpenStudy (anonymous):

OpenStudy (pfenn1):

Triangle ABC is a 30-60-90 triangle. Do you see why? (because angle C is 30 degrees and angle B is 90.) Triangle ABD is also a 30-60-90 triangle. Do you know that in a 30-60-90 triangle the relationship of the sides is \[x:x \sqrt{3}:2x\]?

OpenStudy (pfenn1):

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