Triangular cone with plane convertible to solid body

A triangular cone with plane convertible to solid body, comprising:

• a conical body, being in a substantially hollow conical shape, formed by curling a flexible fan-shaped sheet, and having a large-diameter end, a small-diameter end and a conical plane surrounded between the large-diameter end and the small-diameter end, the large-diameter end being provided with a first connection unit, the conical plane being provided with a plurality of through holes and at least one slot, the at least one slot is configured to be near the small-diameter end, the fan-shaped sheet having a first side edge and a second side edge, the first side edge is provided with a first snap unit, the second side edge being provided with a second snap unit, thereby when the fan-shaped sheet is curled into a hollow conical shape, the first snap unit and the second snap unit are engaged with each other to define the hollow conical shape;
• and
• a base, comprising a second connection unit disposed thereon, and a through opening formed at the center of the base, and the conical body being coupled to the base through the combination of the first connection unit and the second connection unit.