Download Notes Section 3.2

Geometry Notes
Sections 3-2
What you’ll learn
How to use the properties of parallel lines
to determine congruent angles.
 How to use algebra to find angle
measures.
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Vocabulary

No new vocabulary!!!!
Corresponding Angles Postulate
If two parallel lines are cut
by a transversal . . .
What would that
look like????
corresponding angles
are congruent.
How might we use this in a problem?
Find each angle measure.
Find each angle measure.
Find the measure of each angle.
Find each angle measure.
Tell whether each statement is always (A),
sometimes (S), or never (N) true.
2 and 6 are
supplementary
 1  3
 m1 ≠ m6
 3  8
 7 and 8 are
supplementary
 m5 = m4


Determine whether or not l1 ║ l2 , and explain
why. If not enough information is given, write
“cannot be determined.”

Determine whether or not l1 ║ l2 , and explain
why. If not enough information is given, write
“cannot be determined.”

Determine whether or not l1 ║ l2 , and explain
why. If not enough information is given, write
“cannot be determined.”
Find the value of x and y in the figure.
So, corresponding angles are congruent when two
parallel lines are cut by a transversal. . . .
. . . what do you think must be true about the
alternate interior angles formed by two parallel
lines and a transversal?
. . . what do you think must be true about the
alternate exterior angles formed by two parallel
lines and a transversal?
Have you learned .. . .
How to use the properties of parallel lines
to determine congruent angles.
 How to use algebra to find angle
measures.
 How to write proofs about angle
relationships with parallel lines.
 Assignment: Worksheet 3.2
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