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1. Metallah is α in Triangulum, a small constellation just above Aries:

Ksora δ Cassiopeia 2.66 59º 59' N 01h 23m 21.1 429.1
Achernar α Eridani 0.45 57º 29' S 01h 36m 24.3 432.3
Baten Kaitos ζ Ceti 3.74 10º 35' S 01h 49m 27.6 435.6
Metallah α Trianguli 3.42 29º 20' N 01h 50m 27.9 435.9
Segin ε Cassiopeia 3.35 63º 25' N 01h 51m 28.2 436.2
Mesarthim γ Arietis 3.88 19º 03' N 01h 51m 28.2 436.2
Alrisha α Piscium 4.33 2º 31' N 01h 59m 30.2 438.2

The accumulation of prominent stars at vaha mea in Gb7-25 is remarkable:

Gb7-18 (429) Gb7-19 Gb7-20 Gb7-21 (432) Gb7-22 Gb7-23 Gb7-24
Ksora (429.1)     Achernar (432.3)      
Gb7-25 (436)
Baten Kaitos (435.6), Metallah (435.9, Segin (436.2), Mesarthim (436.2)
Gb7-26 Gb7-27 Gb7-28 Gb7-29 (440)
  Alrisha (438.2)    

Flamsteed has another outline for Triangulum than the present one:

In addition he has a smaller triangle (Triangulum Minus) below, now obsolete.

Another picture (by Johannes Hevelius) has the pair of triangles with Pisces at left, oriented as the constellations would appear when looking on a celestial globe from the outside rather than as seen in(side) the sky:

As to the curious name Metallah an explanation is given by Allen:

"The Arabians translated our title [Triangulum] as Al Muthallath, variously seen in Western usage as Almutallath, Almutaleh, Almutlato, Mutlat, Mutlaton, Mutlathum, Mutlathun, and Mutlatun, with probably still other similarly degenerated forms of the original."