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i dont get this question 

 Jun 8, 2018

Best Answer 

 #1
avatar+21978 
+1

ABCD is a square ...

 

\(\text{Let CDA $=$ ADF $=90^{\circ} $ } \\ \text{Let ADE $=$ AED $=\varphi $ } \\ \text{Let EDF $=$ DFE $=$ FED $=$ ADF $-$ ADE $=90^{\circ}-\varphi $} \\ \text{Let AEF $=$ AED $+$ FED $=\varphi + 90^{\circ}-\varphi =90^{\circ} $} \)

 

\(\mathbf{AEF = 90^{\circ}}\)

 

laugh

 Jun 8, 2018
 #1
avatar+21978 
+1
Best Answer

ABCD is a square ...

 

\(\text{Let CDA $=$ ADF $=90^{\circ} $ } \\ \text{Let ADE $=$ AED $=\varphi $ } \\ \text{Let EDF $=$ DFE $=$ FED $=$ ADF $-$ ADE $=90^{\circ}-\varphi $} \\ \text{Let AEF $=$ AED $+$ FED $=\varphi + 90^{\circ}-\varphi =90^{\circ} $} \)

 

\(\mathbf{AEF = 90^{\circ}}\)

 

laugh

heureka Jun 8, 2018

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