There are 3 planes of symmetry in a rectange.
3
A pentagonal prism has 5 planes of symmetry. This is because it can be divided into 5 identical sections by planes passing through the center of the prism and perpendicular to its bases. Each of these planes divides the prism into two equal halves that are mirror images of each other.
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
The answer is 13- for more detail:
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.
3
I think it is only 3
An equilateral triangle has 3 lines of symmetry
A pentagonal prism has 5 planes of symmetry. This is because it can be divided into 5 identical sections by planes passing through the center of the prism and perpendicular to its bases. Each of these planes divides the prism into two equal halves that are mirror images of each other.
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.