• Chapter 4

FORMULAS

ARC LENGTH: s = rθ

ANGULAR SPEED*:  W = θ/t

LINEAR SPEED*: V = s/t = (rθ)/t = rW

AREA OF A SECTOR: A = (½)(r²)θ

VARIABLE DEFINITIONS

s = ARC LENGTH

θ = central angle - angle is measured in RADIANS, so may need conversion

W = ANGULAR SPEED*

t = time

V = LINEAR SPEED*

*For our purposes, "speed" and "velocity" will be the same.  (Don't tell your science teachers...)

• # How to find a value of a function that is in Y1 given the x-value

How to find a value of a function that is in Y1 given the x-value

1. You could graph and use trace until you get around the x-value then look at y

2. You could go to the table and search the x-values to find the y-value

3. You could go to table set “TBLSET” and set the TblStart to the x-value, then look at the table

4. OR… Go to the home screen

5. Press “VARS”

6. Arrow over to “Y-VARS”

7. Select “1:Function”

8. Select “1: Y1” or wherever your function resides

9. Now Y1 shows up on the home screen.

10. Type a “(“ and the x-value of choice. You could finish it with a “)”

11. Push enter

Example: Y1 = 8x + 3

Y1(5) enter

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• # How to insert a regression equation into Y1

How to insert a regression equation into Y1

1. Enter data into list 1 and list 2 (see “how to calculate a regression equation”)

2. Calculate a regression equation (see “how to calculate a regression equation”) Note: your Home screen will now have the regression equation

3. Select the “Y=” button

4. At the Y1 screen, select “VARS”

5. Choose “5. Statistics”

6. Arrow over to EQ

7. Select “1: RegEQ” You should now have the regression equation you calculated in your Y1