alternate interior angles by eaz13803

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									                                                             September 29, 2009




                        3-1 Quizzy Poo !
    1       2
                                n   1. Complete: __________ and 4 are
        4       3
                5       6              alternate interior angles.
                                m
                    8       7
                                    2. Complete: __________ and 8 are
                                       corresponding angles.


3. Suppose the m 3 = 37. Find the m 6.


4. Suppose that m 1 = x + 12 and m 5 = 3x - 36.
   Find x.
                              September 29, 2009




3-2 Proving Lines Parallel
    Please read Pages 134-137 and
    complete the Quick Checks 1-3.

Today's Vocabulary:

flow proof
                   September 29, 2009




Postulates and Theorems
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 Using Theorems 3-5 and 3-6:
Which lines, if any, must be parallel if   3 and      2
are supplementary?
                September 29, 2009




More Theorems
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Using Algebra:
Find the value of x for which l m.

                                     l
   (14 + 3x)                         m
                    (5x - 66)
                                        September 29, 2009




               Closure:
 Name the five methods this lesson gives to
 prove that two lines are parallel.
Show that corresponding angles are
congruent, alternate interior angles are
congruent, same-side interior angles are
supplementary, alternate exterior angles
are congruent, or same-side exterior
angles are supplementary.
                               September 29, 2009




Assignment:

Pages 137-140: #'s 1-39 odds, 41-45
all.

								
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