# Lines and Angles

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Category: Education

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## Presentation Transcript

### 3.1 Lines & Angles :

3.1 Lines & Angles p. 129

### Definitions :

Definitions Parallel lines (ll) – lines that are coplanar & do not intersect l ll m Skew lines – lines that are not coplanar & do not intersect. Parallel planes – 2 planes that do not intersect. Example: the floor & the ceiling l m

### Slide 3:

H G D C A B E F 1. Line AB & Line DC are _______. 2. Line AB & Line EF are _______. 3. Line BC & Line AH are _______. 4. Plane ABC & plane HGF are _______. Parallel Parallel Skew Parallel

### Postulate 13: ll postulate :

Postulate 13: ll postulate If there is a line & a point not on the line, then there is exactly one line through the point ll to the given line.

### Postulate 14:  Post. :

Postulate 14:  Post. If there is a line & a point not on the line, then there is exactly one line through the point that is  to the given line.

### Transversal :

Transversal A line that intersects 2 or more coplanar lines at different points. l m t

### Slide 7:

2 3 4 5 6 7 8 Interior <s - <3, <4, <5, <6 (inside l & m) Exterior <s - <1, <2, <7, <8 (outside l & m) Alternate Interior <s - <3 & <6, <4 & <5 (alternate –opposite sides of the transversal) Alternate Exterior <s - <1 & <8, <2 & <7 Consecutive Interior <s - <3 & <5, <4 & <6 (consecutive – same side of transversal) Corresponding <s - <1 & <5, <2 & <6, <3 & <7, <4 & <8 (same location)

Assignment