Date
Practice C
Understanding Points, Lines, and Planes
Use the figure for Exercises 1–3.
1. “This is plane HIJ.” Explain why this statement is incorrect.
2. Name the plane.
3. Give six names for the line.
4. Explain why Rays ST and TS are or are not the same figure.
5. Explain why Rays ST and TS are or are not opposite rays.
6. Imagine Rays ST and TS drawn in the same plane. Taken together,
what kind of figure do the rays form? __________
7. Name three undefined terms in geometry.
Postulates are basic true statements accepted without proof. Each statement below is incorrect. Rewrite each statement so that it is true.
8. Through any three points there is exactly one plane containing them.
9. If two planes intersect, then they intersect in exactly one plane.
Draw your answer in the space provided.
10. Window glass is transparent, so visible light passes
through it. Imagine a double-paned window as two
nonintersecting planes and sunlight as a line. Use
sketches to show that a line contained in neither
of the planes must intersect both or neither of
the two planes.
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