经过八角形的中心画两条直线，能够得到六个一样的三角形。
Six identical triangles can be formed by drawing two straight lines through an octagon's center point.
直线，圆形，正方形，三角形。
他们把一条鱼的侧面分割为鱼头、鱼身、鱼鳍几部分，用直线、孤线、三角形和圆圈等来表现。
For example, they divided the design of a fish into head, body and fins, alternating straight lines with curves, triangles and circles.
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