Indeed, if someone didn't know what a rectangle is, we could just say that it's an isosceles trapezoid which is also a right trapezoid. With these special cases in mind, a keen eye might observe that rectangles satisfy conditions 2 and 3. Secondly, observe that if a leg is perpendicular to one of the bases, then it is automatically perpendicular to the other as well since the two are parallel. Firstly, note how we require here only one of the legs to satisfy this condition – the other may or may not. We've already mentioned that one at the beginning of this section – it is a trapezoid that has two pairs of opposite sides parallel to one another.Ī trapezoid whose legs have the same length (similarly to how we define isosceles triangles).Ī trapezoid whose one leg is perpendicular to the bases. We'd like to mention a few special cases of trapezoids here. The two other non-parallel sides are called legs (similarly to the two sides of a right triangle). Usually, we draw trapezoids the way we did above, which might suggest why we often differentiate between the two by saying bottom and top base. 105–6.The two sides, which are parallel, are usually called bases. "Excavations at Siraf: First Interim Report." Iran 6, 1968, p. Canby in Footnotes: 1- Whitehouse, David. Unfortunately, not enough inscriptional evidence remains for an identification of the person who lay beneath this marker. 31.50.1, has funerary associations going back to the Romans and continuing in Coptic art and Islamic Egypt, so its appearance here is iconographically consistent with broader trends in commemorative sculpture and architecture. Given the supposed provenance of the stone as coming from a cemetery in Hamadan, the connection to jewelry may not be far-fetched, since Hamadan was a commercial city of which the main exports were "gold work and leather articles." The scallop design in the arches, reminiscent of a similar design in MMA no. Unlike other grave covers, which have complex epigraphic decoration on the sides and little or none on the top, some of the dense ornament here recalls filigree jewelry. Since the inscriptions include a truncation of the basmala and the phrase "to them," the name of the deceased can be assumed to have been carved on the sides of the tomb cover to which this piece was attached. A ridged socle with triangular extensions forms the base of this grave marker and would have been contiguous with the rectangular lid of the tomb. The center section, bordered at right and left by vertical bands of simple interlace, contains a short inscription band and, below it, four rows of four hexagons containing crosses. The latter motif is repeated twice in a band below the arches. On either side of the wider central section are two arches with a scallop design in the arch, below which a vine in the form of a stylized leaf encloses a trefoil. Each of the long sides has three sections. While the limestone grave covers of this type from Siraf are decorated with elaborate kufic inscriptions, most of the ornament on this piece is geometric and vegetal. Extant examples of such tombstones range in date from the late tenth to the early thirteenth century. Tombstone This stone in the form of a small sarcophagus would have been attached to a larger lid of a grave marker.
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