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Mathematics 15 Online
OpenStudy (anonymous):

In this diagram, a rectangular sheet of paper ABCD has been creased so that corner A is now placed on edge CD, at A'. Find the size of angle DEA', given that the size of angle ABE is (a) 30 degrees; (b) 27 degrees; (c) n degrees.

OpenStudy (anonymous):

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OpenStudy (anonymous):

Which angles in the picture are equal to each other?

OpenStudy (anonymous):

A = A' ABE = A'BE

OpenStudy (anonymous):

?

OpenStudy (anonymous):

Your given ABE, your asked to solve DEA'. How then is A'BE related to DEA'? what angle are the corners?

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