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A regular hexagon
A figure with twice as many sides as a triangle is a hexagon. A triangle has 3 sides, so double that would be 6 sides. A hexagon is a polygon with 6 sides and 6 angles. It is a regular polygon with all sides and angles congruent.
triangle
30, its a combination. C(6,3) because there are six vertices of a hexagon and three vertices of a triangle