sentence: this set contains : equilateral triangle ( green ) regular rhombus ( blue ) trapezoid ( red ) hexagon ( yellow ) the second set contains shapes that ca n't be built of the green triangle , but can still be used in tiling patterns square ( orange ) small rhombus ( beige ) pattern blocks are not only just for mathematics , they can also be used to build pictures including animals , flowers , boats and ships , rockets and planes , cars , trains , and many others .