line, 直线, line segment, 线段, ray, 射线, intersecting lines, 相交线, parallel lines, 平行线, perpendicular lines, 垂直线, angle, 角, right angle, 直角, acute angle, 锐角, obtuse angle, 钝角, straight angle, 平角, vertex, 顶点, arms of an angle, 边, shape, 图形, triangle, 三角形, square, 正方形, rectangle, 长方形, circle, 圆形, parallelogram, 平行四边形, rhombus, 菱形, trapezoid / trapezium, 梯形, pentagon, 五边形, hexagon, 六边形.

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