If ABC is an equilateral triangle and AB||CD, what fraction of the area of quadrilateral ABDC is shaded?	Select
A) 1/4  B) 1/(2√3)  C) 1/3  D) 1/2  E) 2/3
Height of triangle = Height of quadrilateral ABDC = (sqrt 3/2)x3.   Area of triangle AB1/3 =( sqrt 3/4)x3x3   Area of quadrilateral ABD1/3 = ((3+6)/2)x((sqrt 3/2)x3)   Therefore, ratio of Area of triangle AB1/3 to Area of quadrilateral ABD1/3 = 1/3
<result>C</result>
If ABC is an equilateral triangle and AB||CD, what fraction of the area of quadrilateral ABDC is shaded?