parallel geometry

Lines and Angles

Activities 6-8

6.1 and 6.2 Proofs about Line Segments and Angles

7.1 Parallel Lines and Angle Relationships

Find the missing angles and identify the postulate or theorem that you used.

7.2 Proving lines are parallel by proving the converse

8.1 Slopes of Parallel and Perpendicular Lines

8.2 Equations of Parallel and Perpendicular Lines

Let's put these skills together as they relate to the world's longest roller coaster - the Steel Dragon 2000 in Nagashima, Japan.

Take a ride

Fill in the Blanks

What is the slope of the line that passes through (0, 150) and (120, 0)?

 $slope\ \left(m\right)\ =\ \frac{y_{2\ }-\ y_1}{\text{}x_{2\ }-\ x_1}$  

Poll

Are the two lines parallel? Justify your answer.

• yes - same slope

• no - different slope

Fill in the Blanks

 If   $\angle$  DAB = 125 $\degree$  , what is the measure of  $\angle$  CBA?