Globe is a spherical model of Earth or celestial bodies. Unlike maps, globes don't distort surface features. Terrestrial globes show landmasses and water bodies. Celestial globes display stars and astronomical objects
Radius is the distance from center to perimeter of a circle or sphere. Name comes from Latin "radius" meaning ray or chariot wheel spoke. Diameter is twice the radius
Radius is a line segment connecting center to circle boundary. Radius is half the length of diameter. Circle can have infinite radii equidistant from center. All radii of a circle are equal in length
Sphere is a three-dimensional round shape with no vertices or edges. Surface area is the curved surface area of a sphere. Sphere is four times the area of a circle
Volume measures three-dimensional space occupied by a shape. Common units include cubic centimeters, meters, inches, and feet. Volume formula: length x width x height for most shapes
Uniform solid sphere has radius R and mass M. Calculation needed about axis through sphere's center