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Lines and angles

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Lines and angles

1. 1. LINES AND ANGLES
2. 2.  Def: line that do not intersect each other are called parallel lines. Illustration: B A D l m C Notation: l || m AB || CD
3. 3. Examples of Parallel Lines• Hardwood Floor• Opposite sides of windows, desks, etc.• Parking slots in parking lot• Parallel Parking• Streets: Laramie & LeClaire
4. 4. Examples of Parallel Lines• Streets: Belmont & School
5. 5.  Def: Lines that intersect to form a right angle are called pependicular linese. m Illustration: n Notation: m n Key Fact: 4 right angles are formed.
6. 6. Ex. of Perpendicular Lines• Window panes• Streets: Belmont and Cicero
7. 7.  Def: a line that intersects two lines at different points t Illustration:
8. 8.  Two angles that are opposite to each other are called vertically opposite angles. t 1 4 1 2 3 4 2 3 5 6 5 8 7 8 6 7
9. 9.  Two angles that form a line (sum=180 ) t1+ 2=180 5+ 6=180 1 22+ 4=180 3 4 6+ 8=1804+ 3=180 5 6 8+ 7=1803+ 1=180 7 8 7+ 5=180
10. 10.  A line segment has two end points. A ray has only one end point. A line has no end points on either side An angle is formed when two lines meet. A transversal is a line that intersect two or more lines at distinct points The various angles formed by a transversal are1. Adjacent angles2. Corresponding angles3. Vertically opposite angles alternate angles4. Linear pair