Sort of depends on how the two triangles are beforehand. One nice way to make four equilateral triangles from six matchsticks is to make a tetrahedron (a triangular pyramid).
No.
Rhombus
a larger equilateral triangle
No but they will make a hexagon
Sort of depends on how the two triangles are beforehand. One nice way to make four equilateral triangles from six matchsticks is to make a tetrahedron (a triangular pyramid).
A parallelogram.
Join the 6 triangles like pizza slices
Equilateral triangles are also equiangular.
No.
draw a big triangle then make a line halfway through it
Rhombus
a larger equilateral triangle
No but they will make a hexagon
Make a triangle, each of whose sides is 2 matchsticks long. This uses six matchsticks. Join the middle points of the sides of this triangle to one another - using another three match sticks. You will then have four small triangles and one large one.
Four equilateral triangles make up another equilateral triangle.
Many different types, but mostly equilateral triangles.