Geometry problem

Berthin Alexander

New member
Joined
Jun 16, 2020
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14
Find the value of "x", if ABC = 90 as shown in the graph.
fdsgdfg4t435dfdf43asdfasdf.png
I have completed some angles and found that AE = DE.
I do not know what else to do. Could you give me some ideas please.
fdgdfgdfg43453453.png
 

lex

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Mar 3, 2021
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236
Can be done with some unpleasant trigonometry, but I'm sure someone can see a smart, simple geometrical solution.
 

lex

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Mar 3, 2021
Messages
236
If you wish I will outline a trigonometric method, so at least you will have one method and the answer.
 

JOwen56

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Feb 5, 2021
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The interior angles of a quadrilateral have a sum of 360 degrees. So if you can find an expression for <EDC, you can form an equation. Does that help?
 

Berthin Alexander

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Jun 16, 2020
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14
The interior angles of a quadrilateral have a sum of 360 degrees. So if you can find an expression for <EDC, you can form an equation. Does that help?
I got 0=0
 

lex

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Mar 3, 2021
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There doesn't seem to have been any progress, so at least here is a trigonometric method for anyone interested. I'm sure there's a much nicer geometric method!
1617704211717.png1617704219776.png
 

Berthin Alexander

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Jun 16, 2020
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lex

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Mar 3, 2021
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You're welcome. I know it's not quite what you are looking for. Let me know if you get a nice geometric proof.
 
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