Chapter 1: Q6 (page 24)
Postulate 6 is sometimes stated as 鈥淭wo points determine a line.鈥
Do three points determine a line?
Short Answer
Three points determine a line only if they are collinear points.
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Chapter 1: Q6 (page 24)
Postulate 6 is sometimes stated as 鈥淭wo points determine a line.鈥
Do three points determine a line?
Three points determine a line only if they are collinear points.
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A plane can be named by three or more non-collinear points it contains. In chapter 12 you will study pyramids like the one shown at the right below.

Name two planes that intersect in .
Draw a vertical plane intersecting a horizontal line in a point .
If you measure with a protractor you get more than . But you know that represents a right angle in a box. Using this as an example, complete the table.


Name the vertex and sides of .

Draw two points P, Q on a sheet of paper. Fold the paper so that fold line f contain both P, Q. Unfold the paper. Now fold so that P falls on Q. Call the second fold g. Lay the paper flat and label the intersection of f and g as X. How are points P, Q and X? Explain.
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