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平面几何中,三角形的重心定理及有关中线的性质在证题和解决实际问题中,有着广泛的应片用,现就梯形的相应性质补充如下: 梯形的重心定理定义:梯形两底的中点联线,叫做梯形的中线。引理:梯形的重心在它的中线上。这里所说的重心是指面积重心。
In the plane geometry, the center of gravity of the triangle and the nature of the centerline have a wide range of application in the questions and solutions to practical problems. The corresponding properties of the trapezoid are now added as follows: The trapezoidal center of gravity theorem is defined as the midpoint of the trapezoidal two bottoms. Line, called the trapezoidal midline. Lemma: The trapezoidal center of gravity is on its midline. The center of gravity mentioned here refers to the area of gravity.