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# 13 3 And 13 4

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### 13 3 And 13 4

1. 1. Today • Review • Notes • SPICSA 1
2. 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. 3
4. 4. 13­3 Parallel and Perpendicular Lines More Review • The slope of a line is  4
5. 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. 6. Scalar Vector • Multiply the vector by the scale factor • If  • Then 6
7. 7. Vector Sum • Vectors can be added: • (a,b) + (c,d) = (a+c , b+d) 7
8. 8. SPICSA • 537 2,4,6 • P541 2,4,6,8,10,12  8
9. 9. 9