A sphere is a perfectly-round 3D shape with one continuous curved surface; every point on the surface is the same distance from the center. All the ends of its surface are equidistant (an equal distance) from its center.

Characteristics of a Sphere

Spheres are perfectly round and have the following:

  • one curved surface;
  • no edges;
  • no vertices;
  • all the points are the same distance from the center.

Here are the properties of other common 3D shapes:

  • Cube: 6 faces, 12 edges, and 8 vertices;
  • Square-based pyramid: 5 aces, 8 edges, and 5 vertices;
  • Cuboid: 6 faces, 12 edges, and 8 vertices;
  • Tetrahedron: 4 faces, 6 edges, and 4 vertices;
  • Octahedron: 8 faces, 12 edges, and 6 vertices.

Fun Facts About Spheres

  1. Spheres can be found everywhere, in the food we eat and especially in sports with basketballs, footballs, tennis balls, etc.
  2. All points on the surface of a sphere are the same distance from the center.
  3. Spheres are perfectly symmetrical shapes.
  4. The distance from the center of a sphere to its surface is known as the radius.
  5. The most significant distance through a sphere is the diameter, twice the size of the radius.
  6. You can work out a sphere’s volume and surface area using Pi (π).
  7. A sphere is circular in every direction.
  8. Sometimes a sphere has a north and a south pole on opposite ends of its surface.
  9. A sphere can be divided into two hemispheres, equal in size, by a flat 2D surface that goes through the center.
  10. We often use words like the North Pole, South Pole, hemisphere, and equator when talking about the Earth. However, the Earth isn’t a sphere – it is more of a flattened sphere (spheroid).
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