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Chapter 3: 18Q (page 75)
Complete each statement with the word always, sometimes, or never.
Two lines in the plane of the floor are _?_skew.
Two lines in the plane of the floor are never skew.
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Given:
Prove bisects
Alan tried to prove Postulate 10 as shown below. However, he did not have valid proof. Explain why not.
If two parallel lines are cut by a transversal, then corresponding angles are congruent.
Given ; transversal cuts and
Prove:
Statement | Reason |
1. | Given |
2. | If two parallel lines are cut by transversal then alt. int. are |
3. | Vert. are |
4. | Transitive Property |
Name six lines parallel to 
Exercises 23 – 29 refer to the diagram in Step 2 of Exercise 22
Suppose the top and bottom of the box lie in parallel lines. Explain how theorem 3.1 can be used to prove .
State the postulate or theorem that justifies each statement.
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