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- 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 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 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。
- 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
- 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 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
- The plane climbed until it was clear of the clouds. 飞机爬升穿出了云层。
- 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。
- The flier is flying a new-type jet plane on trial. 飞行员正在驾驶一架新式喷气机作试验飞行。
- 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 method to find the acceleration of a point is call pole-based method, or composition method, which is the basic method to finding the acceleration of a point in a plane figure. 这种求解加速度的方法称为基点法，也称为合成法。是求解平面图形内一点加速度的基本方法。
