Editor
If a flag-staff 6 m high placed on the top of a tower makes the shadow $2\sqrt{3}$ m on the ground, then the angle of elevation of the sun is
Difficulty: Easy
A: 
$30^{\circ}$
B: 
$35^{\circ}$
C: 
$45^{\circ}$
D: 
$60^{\circ}$
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