Answer :

YellowGold
If these are the missing parts: 

What is the quadrilateral?

a.rhombus
b. rectangle
c. trapezoid
d. square

The quadrilateral formed by the 
two equilateral triangles taped together is A. RHOMBUS.

Rhombus has equal sides but its is different from a square because it looks like a diamond. 
Rhombus also have parallel opposite sides and equal opposite angles. 
${teks-lihat-gambar} YellowGold

Answer: The correct answer is Rhombus

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