The Great Pyramids at Giza are, but the Meso-Americans were truncated.
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
No, a square is not made up of four equilateral triangles. A square has four equal sides and four right angles, while equilateral triangles have three equal sides and three equal angles, each measuring 60 degrees. However, you can arrange two equilateral triangles to form a rhombus, which can be manipulated to fit within a square, but they do not constitute the same geometric shape.
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
Infinitely many. When you have one equilateral triangle, you can join up the midpoints of its sides to make into 4 more equilateral triangles. And then each one of those can be split up and so on.
Put the triangles in a line alternately pointing up and down.
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
square
No, a square is not made up of four equilateral triangles. A square has four equal sides and four right angles, while equilateral triangles have three equal sides and three equal angles, each measuring 60 degrees. However, you can arrange two equilateral triangles to form a rhombus, which can be manipulated to fit within a square, but they do not constitute the same geometric shape.
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
Infinitely many. When you have one equilateral triangle, you can join up the midpoints of its sides to make into 4 more equilateral triangles. And then each one of those can be split up and so on.
Many different types, but mostly equilateral triangles.
3
Put the triangles in a line alternately pointing up and down.
It has a four sided square base and four other triangular sides reaching up to an apex. It is a pentahedron. If the four triangles are equilateral, it is known as a Johnson solid, and six of the pyramids will fit together to make an exact cube. If the four triangles are not equilateral, then they are isosceles.
Four equilateral triangles make up another equilateral triangle.
Ancient Egypt Pyramids.
Yes, as long as the equilateral triangles are all of the same dimensions. One can be he base while the other three will have one edge on the base and he other two connecting to another triangle with the three standing up triangles meeting at one point.