4 equilateral triangles, 2 as the base, 1 inverted in the space made, and the last one on top.
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2 triangles and 3 rectangles
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
You need 3,5,7,9... triangles. They have to be equilateral triangles. 1,3,5,7... need to be upside down while 2,4,6,8... have to be right side up. ______ /\ /\ /\ / \ / \ / \ /__\/__\/__\ I know, bad picture, hopefully you get the point though.
2 hexagons and six triangles
An infinite of infinitely small ones. You would need to use calculus to calculate the volume of a cone given a single triangular cross-section.