A triangle.
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A triangular based pyramid has four faces, four veritices, and six edges.
A triangle has 3 sides and 3 vertices's
A hexagon has six sides, and an octagon has eight. 3 hexagons and 3 octagons have 3*6 + 3*8 sides = 18 + 24 sides = 42 sides altogether.
A polygon with 3 sides is a triangle.
A triangle has 3 sides.