There are 3 planes of symmetry in a rectange.
Ah, a pentagonal prism is a beautiful shape, friend! It has five planes of symmetry, just like the number of sides it has. Each plane can be thought of as a mirror that can reflect the prism perfectly. Isn't that just lovely?
3
There are 3 lines of symmetry ina 6-sided shape.
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
it depends on what kind of 3D shape you want. example= A sphere has an infinite amount of symmetry lines
There are 3 planes of symmetry in a rectange.
A rectangular solid that is not a cube has 3 planes of symmetry.
9 planes in Cube 3 Planes in Cuboid
If a two-dimensional shape has a line of symmetry, the shape is also symmetrical with respect to the plane passing through that line and perpendicular to the plane of the shape. For example, the floor of a rectangular room is symmetrical about a vertical plane halfway along the length (or breadth) of the room. Some 3-dimensional shapes will also have planes of symmetry. A sphere has infinitely many. An ellipsoid has three - one each along two of its axes. A cuboid, similarly, has 3. A torus (doughnut) has one. A pyramid with a n-gon base will have n vertical planes, and so on.
It is the set of points, in 3-dimensional space, defined by the intersection of two planes which define faces of the shape.
Ah, a pentagonal prism is a beautiful shape, friend! It has five planes of symmetry, just like the number of sides it has. Each plane can be thought of as a mirror that can reflect the prism perfectly. Isn't that just lovely?
3
I think it is only 3
An equilateral triangle has 3 lines of symmetry
There are many possible answers. Some are: A sphere or ellipsoid sliced by two planes A cone sliced by two planes A toroid (doughnut) with a wedge cut out An infinite circular prism sliced by two planes.
There can be no closed 3D shape with only one square and 3 triangles.