Upload
sydney-hensley
View
216
Download
0
Tags:
Embed Size (px)
Citation preview
Background Vocabulary
• Plane: an infinite, flat surface.• Parallel lines: lines in a plane that
never meet. l l is the symbol for parallel lines.
• Transversals: lines that intersect two or more parallel lines.
More Vocabulary1. Congruent angles: two
angles that have equal measures.
2. Ray: part of a line that has an endpoint and extends forever.
3. Angles: two rays with a common endpoint.
Supplementary Angles
Two angles whose
measures add up
to 180°.
Supplementary Angles
Two angles whose
measures add up
to 180°.
90°90°
2.
1.
3. 4.
5. 6.7. 8.
Alternate Interior Angles
Angle 3 and Angle 6 are congruent angles. This means they have the same measure.
The measure of angle 4 and themeasure of angle 6 are congruent
ANDThe measure of angle 3 and the measure of angle 5 are congruent.
NOTE
Alternate Interior Angles are on “alternate” sides and on the “interior” of the parallel lines.
The measures of Angle 1 and Angle 3 are congruent.
The measures of Angle 2 and Angle 4 are congruent.
The measures of Angle 5 and Angle 7 are congruent.
The measures of Angle 6 and Angle 8 are congruent.
Corresponding Angles
These angles are a bit trickier. You have to imagine cutting your diagram apart, and then pasting one part on top of the other.
Angle 1 and Angle 5 are congruent.Angle 2 and Angle 6 are congruent.Angle 3 and Angle 7 are congruent.Angle 4 and Angle 8 are congruent.
Demonstrate Your Knowledge
Now that you’ve seen what is congruent, you can take the measurement of “1” angle and
figure out the others. Let’s try it!