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April 20th, 2018, 04:15 AM   #1
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trapezoid

I need to find a formula that use r to formulate the long side of the trapezoid (DC).
Note: In the picture desribe = describe.
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File Type: jpg טרפז.jpg (24.0 KB, 13 views)
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April 20th, 2018, 05:12 AM   #2
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Math Focus: Number Theory
Since AB||DC, I would start with the Parallel Postulate
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April 20th, 2018, 05:16 AM   #3
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A few things:
1.Question: What is the Parrallel Postulate?
2. How the terminology of circle that "locked" in the trapezoid? i write inscribe, but is it the right terminology?
3. I still don't know how to slove the problem?
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April 20th, 2018, 05:48 AM   #4
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Bisect angle BCD.
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April 20th, 2018, 06:32 AM   #5
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still I don't know what to do.
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April 21st, 2018, 05:24 PM   #6
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I am irritated when a person posts the same question on multiple help forums. So if you want answers from me in the future, don't do this.

Here's a solution to your problem. I leave it to you to supply the reasoning for each step.

Thanks from topsquark
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April 24th, 2018, 11:35 AM   #7
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or $\displaystyle b=2r \cdot \tan 55^{\circ}$
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