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Lesson 3-1 Parallel Lines and Transversals
Lesson 3-2 Angles and Parallel Lines
Lesson 3-3 Slopes of Lines
Lesson 3-4 Equations of Lines
Lesson 3-5 Proving Lines Parallel
Lesson 3-6 Perpendiculars and Distance
Example 2 Use an Auxiliary Line
Example 3 Find Values of Variables
OBJECTIVE: To use algebra to find angle
measurements (2.9.8E) (M8.C.1.1.3)
Grid-In Test Item
What is the measure of RTV?
Read the Test Item
Be sure to identify it correctly
on the figure.
Solve the Test Item
Alternate Interior Angles Theorem
Definition of congruent angles
Substitution
Alternate Interior Angles
Theorem
Definition of congruent
angles
Substitution
Angle Addition
Postulate
Write each digit of 125 in a column of the grid.
Then shade in the corresponding bubble in each
column.
Answer:
Grid-In Test Item
What is the measure of IGE?
Answer:
ALGEBRA If
and
find x and y.
Find x.
by the Corresponding Angles
Postulate.
Definition of congruent angles
Substitution
Subtract x from each side and
add 10 to each side.
Find y.
by the Alternate Exterior Angles
Theorem.
Definition of congruent angles
Substitution
Simplify.
Add 100 to each side.
Divide each side by 4.
Answer:
and
ALGEBRA If
find x and y.
Answer:
REVIEW: Find the measurement of angle 1.
36°
1
31 °
Draw a parallel line (between the other 2
lines through angle 1 vertex and use
Alternate Interior angles) Answer: 67 °
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