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Which volume is the center line of the triangle? What page is the math book?
People's education printing plate eighth grade mathematics volume II page 47.

The line segment connecting the midpoints of two sides of a triangle is called the midline of the triangle, which is parallel to the third side and equal to half the length of the third side. The line segment connecting the midpoints of the two waists of a trapezoid is called the trapezoid midline, which is parallel to the two bottoms and equal to half the sum of the two bottoms.