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Yes. You can always draw a "diagonal" line between opposite corners of any four-sided figure. Then, cutting along that line, you wind up with two triangles out of which the figure could have been made.
Depends on what figures are "from brackets".
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
Because the sum of the sides of three triangles is nine... Placing three triangles together so they all touch effectively removes four of the total number of sides - leaving five.