A square pyramid.
You can make square pyramid.
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
a decagon
square-based pyramid
A square pyramid.
Not necessarily. The solid could be a square based cuboid (hexahedron).
You can make square pyramid.
The figure is a pyramid and the base is a square.
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
a rectangular pyramid and a square pyramid
Pyramid. Work: 4 sides (that you usually see) are triangles, the base (bottom) is a square
The only thing I can come up with would be a tetrahedron. You could make a pyramid with a square (open) base, I guess.
A tetrahedron is a solid figure with four flat surfaces that are triangles. Each face of a tetrahedron is a triangle, making a total of four triangular faces in the shape.
a decagon
square-based pyramid
A net has two equilateral triangles and 3 rectangles. What solid figure might it make?