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it is a pyramid
An isosceles trapezium.
The lateral of a pyramid is a line commencing from the tip, down it's face and finishes at the middle of one of the base's sides. The lateral area of a pyramid is one of it's sloped faces, or outer wall if you wish.
Prisms have polygonal cross sections and several rectangular lateral faces. Cylinders have circular cross sections and one curved lateral face.
No, there are more that triangular prisms. There are also rectangular prisms and one other that i cant recall.=-)