Why Is the Angle Considered 90 Degrees?

Thread starter Joza
Start date Feb 6, 2007
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Joza

Thread starter
Feb 6, 2007

http://www.e-xamit.ie/2005test/php/GetDocByID.php?id=562&prep=565&soln=562&tip=570&port=566

I can't figure out how it takes the angle dec to be 90 degrees? How?

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arildno

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Feb 6, 2007

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.

Why Is the Angle Considered 90 Degrees?

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Why Is the Angle Considered 90 Degrees?

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