9 planes in Cube 3 Planes in Cuboid
I think it is only 3
A circle, square, and a triangle all have rotational symmetry.
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.
A scalene triangle, A trapezoid, an irregular pentagon.
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
3
A cube has three planes of symmetry.
I think it is only 3
How many lines of symmetry does an equilateral triangle have?
A triangular based pyramid has no lines of symmetry. However, if each of the non-base triangular sides are equal it will have 3 planes of symmetry. If the base triangle is also equal, it will have 6 planes of symmetry.
The answer is 13- for more detail:
A circle, square, and a triangle all have rotational symmetry.
Equilateral triangle.
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.