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Definition of Coplanar

A set of points, lines, line segments, rays or any other geometrical shapes that lie on the same plane are said to be Coplanar.

More About Coplanar

Parallel lines in three-dimensional space are coplanar, but skew lines are not.

Example of Coplanar

EXAMPLE OF Converging Lines All the points A, B, C, and D in the plane P are coplanar

Video Examples: What are coplanar points

Solved Example on Coplanar

Choose the Correct Statement/Statements.

  • 1. Points F, A, L, I, C, G, E, O, and B are coplanar.
  • 2. Points G, E, F, and A are coplanar.
  • 3. O, A, and B are coplanar.
  • 4. Points F, A, L, I, C are coplanar.

example of  Coplanar

  • A. 1 and 2 only
  • B. 3 and 4 only
  • C. 4 only
  • D. 1 only

Correct Answer: C


  • Step 1: Corner is a point where two lines meet or intersect.
  • Step 2: Here, figure 1 is a square, figure 2 is a circle, figure 3 is a rectangle, and figure 4 is a pentagon.
  • Step 3: A square has 4 corners and a rectangle has also 4 corners.
  • Step 4: So, figure 1 and figure 3 have 4 corners each.

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