The statement "All spheres are similar" is **False**. In geometry, when we say shapes are similar, it means they have the same shape but can be different sizes. Two shapes are similar if one can be obtained from the other by uniformly scaling (enlarging or reducing), without changing the shape.
In the case of spheres, all spheres are similar to each other because they have the same shape, which is a perfectly round three-dimensional object. However, they can vary in size (radius or diameter). So, while all spheres are similar in shape, they can have different sizes, which means they are not identical in size but still belong to the same geometric category.
