A rectangular prism.
A rectangular prism is a hexahedron with some rectangular sides. There is no requirement that all sides be rectangles. If they are, the solid is a right rectangular prism, or cuboid.
Hexahedron
A cuboid would fit the given description
A net has two equilateral triangles and 3 rectangles. What solid figure might it make?
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cube
cuboid
A rectangular prism.
A rectangular prism.
A rectangular prism.
the solid figure with six congruent sides isva cube
A side of a solid figure is called a face.