The area of the rhombus with the side 12 and the angle between the sides 60° equal to 124.704
where a is the side, h is the height.
where d1,d2 are the diagonals.
where d is the diagonal, α° is the opposite angle in degrees.
where d is diagonal, α° - the included angle in degrees.
where r is the radius of the inscribed circle, α° is the angle between the parties in degrees.
where r is the radius of the inscribed circle,the a - side.
A rhombus is a parallelogram with all sides equal.
Rhombus area formula 
where a is the side, α° is the angle between the sides in degrees.
Solution:
S = a2·sin(α°)
= 122·sin(60°)
= 144·0.866
=
124.704
a: The area of the rhombus with the side 12 and the angle between the sides 60° equal to 124.704