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Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

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Section
BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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Given: A C D C ¯ A B
Prove: D A ¯ C B ¯

Chapter 2.CR, Problem 36CR, Given: ACDCAB Prove: DACB

To determine

To prove:

DA¯ is parallel to CB¯.

Explanation

Given:

The given statement is,

AC and DC¯AB

Figure (1)

Properties used:

If two parallel lines are cut by a transversal, then the pairs of the alternate interior angles are congruent.

If two lines are cut by a transversal and the pair of corresponding interior angles are congruent, then the lines are parallel.

Approach:

The given statement is,

AC and DC¯AB

C and 1 are alternate interior angles.

So,

C1

Use Transitive property of congruence.

A1

A and 1 are corresponding congruent angles.

So,

DA¯CB¯

The proof for the given statement is shown in the following table,

Proof
Statements Reasons
1

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