How is this 90 degrees?

  • Thread starter Joza
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  • #1
Joza
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http://www.e-xamit.ie/2005test/php/GetDocByID.php?id=562&prep=565&soln=562&tip=570&port=566 [Broken]


I can't figure out how it takes the angle dec to be 90 degrees? How?
 
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  • #2
arildno
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Line segment ce is parallell to line segment ab. Line segment ad is perpendicular to ab at a, hence, ad is perpindicular to ec at e.
 

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