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- A closed plane figure bounded by three or more line segments. 多边形；多角形由三条或更多的线段围成的一个封闭的平面图形
- a closed plane figure bounded by straight sides. 被垂直的面限制边界的有限平面形。
- a closed plane figure bounded by three or more line segments 由三条或更多的线段围成的一个封闭的平面图形
- A four-sided plane figure with four right angles. 矩形，长方形具有四个边的方形，有四个直角
- A plane figure with four sides and four angles. 四边形有四个边和四个角的平面图形
- A four-sided plane figure with opposite sides parallel. 平行四边形一种有四条边且每两条边对应平行的平面图形
- A plane figure bounded by two radii and the included arc of a circle. 由两个半径和两个半径中间的弧所形成的一个平面形状。
- An instrument that measures the area of a plane figure as a mechanically coupled pointer traverses the perimeter of the figure. 测面仪一种仪器，当机械连结的探针扫过平面图形的周线时能测出图形的面积
- A plane figure consisting of four points,no three of which are collinear,connected by straight lines. 四边形，四角形由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- A plane figure consisting of four points, no three of which are collinear, connected by straight lines. 四边形，四角形由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- Mathematics A plane figure consisting of four points, no three of which are collinear, connected by straight lines. 四边形，四角形：由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
- At an angle,especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face. 倾斜的，尤其是连接平面图上两个不相邻的角落的，或连接多面体任意两个不在同一面上的顶点的直线的。
- Which of the following plane figures have reflectional symmetry? 下列哪些平面图形具有反射对称性质？
- The surface generated by a straight line intersecting and moving along a closed plane curve, the directrix, while remaining parallel to a fixed straight line that is not on or parallel to the plane of the directrix. 柱面一条直线与一个封闭的平面曲线相交及沿着平面曲线移动所形成的平面，准线则与一个不在此准线平面上或者不与此准线平面平行的固定直线保持平行
- The plane figure formed by connecting three points not in a straight line by straight line segments;a three - sided polygon. 三角形一种由直线线段连接不在一条直线上的三点形成的平面图形；三边图形
- The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon. 三角形一种由直线线段连接不在一条直线上的三点形成的平面图形；三边图形
- A triangle is a plane figure. 三角形是平面图形
- An instrument for copying a plane figure to a desired scale,consisting of styluses for tracing and copying mounted on four jointed rods in the form of a parallelogram with extended sides. 缩放仪一种按所需的比例复制平面图片的仪器，由用于描绘和复制的描画针组成，描画针置于四根有活节的杆上，四根杆构成可调整边长的平行四边形
- This article has studied the definite integral used in the physics application from power,force,moment of inertia,orthocenter of plane figure and calculation of inertia moment,mainly utilizing the research method from particulars to generals. 本文从功、力、转动惯量、平面图形的形心和惯性矩的计算这几个方面研究了定积分在物理学中的应用，主要运用了从特殊推广到一般的研究方法。
- An instrument for copying a plane figure to a desired scale, consisting of styluses for tracing and copying mounted on four jointed rods in the form of a parallelogram with extended sides. 缩放仪一种按所需的比例复制平面图片的仪器，由用于描绘和复制的描画针组成，描画针置于四根有活节的杆上，四根杆构成可调整边长的平行四边形
