Geometry

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Across
  1. 4. the figure formed by two rays or line segments, called the sides of the angle, sharing a common endpoint, called the vertex of the angle
  2. 5. boundless three-dimensional extent in which objects and events have relative position and direction
  3. 6. the amount of space, measured in cubic units, that an object or substance occupies
  4. 7. the process of establishing the magnitude of some attribute of an object relative to some unit of measurement
Down
  1. 1. form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture, material composition
  2. 2. any particular extent of space or surface
  3. 3. the border or outer boundary of a two-dimensional figure.