My Math Forum trapezoid

 Geometry Geometry Math Forum

April 20th, 2018, 04:15 AM   #1
Banned Camp

Joined: Dec 2017
From: Tel Aviv

Posts: 87
Thanks: 3

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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 April 20th, 2018, 05:12 AM #2 Newbie   Joined: Sep 2013 From: Reno,NV Posts: 14 Thanks: 1 Math Focus: Number Theory Since AB||DC, I would start with the Parallel Postulate
 April 20th, 2018, 05:16 AM #3 Banned Camp   Joined: Dec 2017 From: Tel Aviv Posts: 87 Thanks: 3 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?
 April 20th, 2018, 05:48 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,926 Thanks: 2205 Bisect angle BCD.
 April 20th, 2018, 06:32 AM #5 Banned Camp   Joined: Dec 2017 From: Tel Aviv Posts: 87 Thanks: 3 still I don't know what to do.
 April 21st, 2018, 05:24 PM #6 Member   Joined: Jan 2016 From: Athens, OH Posts: 93 Thanks: 48 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
 April 24th, 2018, 11:35 AM #7 Senior Member     Joined: Feb 2010 Posts: 711 Thanks: 147 or $\displaystyle b=2r \cdot \tan 55^{\circ}$

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