What are the two ways to name a plane shown in the lesson?

Conditions

• The object being named is a plane.
• When using three points, they must not lie in a straight line.

Reasoning, step by step

1. Method 1: Place a capital letter (e.g., M) at a corner of the plane sketch and call it Plane M.
2. Method 2: Mark three points (e.g., A, B, C) on the plane that are not collinear and call it Plane ABC.

Example

The instructor draws a parallelogram, labels a corner M, and writes 'Plane M'. He then marks points A, B, C on the plane and writes 'Plane ABC'.

Common misconceptions

• Using four, five, or six points to name a plane.
• Using three collinear points to name a plane.

Watch the explanation

Explore next

• Why must the three points used to name a plane not be collinear?
• How do you name a line using two points?