3.收敛的平面图形、除三角形外
semicircle 半圆 concentric circles 同心圆 quadrilateral 四边形pentagon 五边形hexagon 六边形 heptagon 七边形 octagon 八边形nonagon 九边形 decagon 十边形 polygon 多边形 parallelogram 平行四边形 equilateral 等边形 plane 平面 square 正方形，平方 rectangle长方形 regular polygon 正多边形 rhombus 菱形 trapezoid 梯形
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