Connected parallelograms

There are some parallelograms whose length of two sides is 2 cm and 1 cm, and one inside angle is 60 degrees.

These are connected at the vertex so that all of the 2 cm sides are parallel as shown in Fig.1 and Fig.2.

(1) A and B were connected as shown in Fig.1.

Find the area ratio of the sum of the area of two triangles painted black and the area of one parallelogram.

Answer