You have to choose one that fits the available data. Check the relationship between the data you know, for example an angle between two sides, etc.
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B: angles and side lengths
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None unless (for example) you draw lines from each corner to the center, and then you'll have five. But there's an infinite number of ways of drawing isosceles triangles in a pentagon. (Choose any part of one edge, and use that as the base of your triangle, and then choose a height).
6 choose 3 = 20. Hence there are 20 triangles in a hexateron
It can form two quadrangles and three triangles. It has seven sides.