An hexagonal based pyramid would fit the given description
Chat with our AI personalities
pyramid
A 6 sided hexagon has 4 triangles
you can split a regular hexagon into 6 triangles
It's easy all you have to do is make a heart shape
Put four equilateral triangles so that each one of them has a vertex at a single point and the triangles abut one another. The shape will be 4/6 (= 2/3) of a regular hexagon.