1. Today
• Review
• Notes
• SPICSA
1

2. Review
• We are working on a coordinate plane
• The difference between points is
• The formula for a circle is
• Where (a,b) is the center and r is the radius
2

3. 3

4. 13­3 Parallel and Perpendicular Lines
More Review
• The slope of a line is
4

5. 13­3 Parallel and Perpendicular Lines 13­4 Vectors
• Parallel lines have equal slopes
• A quantity with a magnitude and direction
• The magnitude is the length of the arrow
• Perpendicular lines have negative reciprocal slopes
5

6. Scalar Vector
• Multiply the vector by the scale factor
• If
• Then
6

7. Vector Sum
• Vectors can be added:
• (a,b) + (c,d) = (a+c , b+d)
7

8. SPICSA
• 537 2,4,6
• P541 2,4,6,8,10,12
8

9. 9