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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 cysts are classically midline, associated with the hyoid bone, move with swallowing or tongue protrusion, and often initially present with some degree of inflammation, sometimes after an upper respiratory tract infection.
I recently had the opportunity to place the new MIDLINE II-Ti, which has the same easy placement as the PEEK cage with the added advantages of the titanium coating.
Through a midline Raphae incision, dissection with electrocautery revealed several loculated fluid collections of 0.
The various parameters are automatically plotted as a function of distance along the midline contour.
Oswestry scores in the midline group fell from 20 at baseline to approximately 15 on follow-up day 1, to 13 on day 7, and to 12 on day 28.
Although imaging of this tumor is somewhat nonspecific, this rare entity should be considered in the differential diagnosis of a male patient presenting with a single, homogeneous, soft-tissue mass occurring at or near the midline, especially if in the mediastinum or retroperitoneum.
VENTRAL SURFACE: Ventral midline of prosternum lacking a carina; anterior half of mesosternum broadly domed, lacking tumescences, posterior half of mesosternum broadly depressed, hind margin deeply posteriorly concave, posterolateral angles slender, acute; metasternum triangular, strongly raised along longitudinal midline, anterior margin angulate, lateral margins strongly anteriorly convergent, posterior margin transversely truncate; space between middle and hind coxae distinctly less than diameter of coxae.
The idea is not only to promote our function-specific tools, but also offer service contracts for all tools that might be used on a construction site,' explained Amin Hamdan, managing partner, Midline Industrial Equipment.
1,7,11) NUT midline carcinomas are most commonly diagnosed as squamous cell carcinoma, poorly differentiated carcinoma, and sinonasal undifferentiated carcinoma.
Assuming the above, the difference between the correct puncture site and the actual needle tip position is B*tan[alpha]/sin[theta] cm (assuming the subcutaneous distance is B cm, the insertion angle at the midline is set at 6 and the transverse deviation angle is [alpha], Figure 2).
RN Documentation of PICC, Midclavicular, and Midlines must include, but is not limited to:
Key words: aesthetic perception, smile, incisal edge, dental midline