How many regions would 79 lines separate a 2-D plane? Assume that no three lines cross at the same point, i.e. lines only cross in pairs.
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举一反三
- How many lines does a product description usually have? A: 1-2 lines B: 4-6 lines C: 7-9 lines D: 10-12 lines
- ______ lines are, by definition, lines on the same plane that never join. A: Lateral B: Intersecting C: Vertical D: Parallel
- The contour lines on the plane are the lines parallel to the H-plane in the plane.
- The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- Aredimension lines thicker, thinner, or the same thickness as extension lines?