#1
+19482
+19482 +1
ABCD is a square ...
\(\text{Let CDA $=$ ADF $=90^{\circ} $ } \\ \text{Let ADE $=$ AED $=\varphi $ } \\ \text{Let EDF $=$ DFE $=$ FED $=$ ADF $-$ ADE $=90^{\circ}-\varphi $} \\ \text{Let AEF $=$ AED $+$ FED $=\varphi + 90^{\circ}-\varphi =90^{\circ} $} \)
\(\mathbf{AEF = 90^{\circ}}\)
heureka
Jun 8, 2018
#1+19482
+19482 +1
Best Answer
ABCD is a square ...
\(\text{Let CDA $=$ ADF $=90^{\circ} $ } \\ \text{Let ADE $=$ AED $=\varphi $ } \\ \text{Let EDF $=$ DFE $=$ FED $=$ ADF $-$ ADE $=90^{\circ}-\varphi $} \\ \text{Let AEF $=$ AED $+$ FED $=\varphi + 90^{\circ}-\varphi =90^{\circ} $} \)
\(\mathbf{AEF = 90^{\circ}}\)
heureka
Jun 8, 2018
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