CK-12 Geometry-Concepts

http://www.ck12.org Chapter 3. Parallel and Perpendicular Lines

Given:landmand transversalt

6 3 ∼= (^66)
Prove:l||m
TABLE3.3:
Statement Reason
1.landmand transversalt^63 ∼=^66 Given

2.^63 ∼=^62 Vertical Angles Theorem
3.^62 ∼=^66 Transitive PoC
4.l||m Converse of the Corresponding Angles Postulate

Watch this video for help with the Examples above.

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/80761

CK-12 Foundation: Chapter3AlternateInteriorAnglesB

Vocabulary

Alternate Interior Anglesare two angles that are on theinterior oflandm, but on opposite sides of the transversal.

Guided Practice

1. Isl||m?


2. What doesxhave to be to makea||b?