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(1) A midline of a triangle is the line segment joining the midpoints of two sides of the triangle. The midline is parallel to the third side, or base, of the triangle. The length of the midline is one-half that of the base. The areas of the two parts into which the midline divides the triangle are in the ratio 1:3.

(2) The midline, or median, of a trapezoid is the line segment joining the midpoints of the nonparallel sides of the trapezoid. The midline is parallel to the bases of the trapezoid, and its length is one-half the sum of the lengths of the bases.

References in periodicals archive ?
The midline was centered on the middle of the remaining central incisor.
It saved material costs and further increased nursing efficiency because 79% of the midlines lasted through the completion of therapy, and nurses were able draw blood through 84% of the midlines up to the time of catheter removal.
Jessica Barrett, National Sales Manager, adds, "In the past year, HDC has gained the recognition of supplying the highest quality PICCs and midline catheters to the healthcare market.
Braun's unique Spin-Lock(R) luer to firmly anchor PICCs and midlines while also providing greater ease of care.