1. Objective- To use variables in formulas to describe situations.
Formula- an equation which defines the relationship of one variable to other variables or numbers.
A = L w L
Area is described in terms of length and width. w

2. h 1
A = b h 2 b
A is given in terms of b and h.

3. A perfect game in bowling is 300. Most players play with a handicap.
H= Handicap
A= Average bowling score
H = 0.8(200 - A)
If my average is 130 and
Mr. Roberts is 185, find
our handicaps.

4. Estimate the number of cars allowed on a freeway.
N = estimated # of cars
allowed on a roadway.
L = # of lanes on the road.
d = length of road (ft.)
s = average speed (mph)
20 L d
N =
600 + s 2
Problem:
Find N if the length of
the road is 200 yards, the
number of lanes is 3, and
the average speed is 60mph.

5. Volume of the Earth V = r 4 3 Volume Formula of a sphere Problem:
If the radius of the earth is
approximately 8000 miles,
find its volume.

6. Review Problem #13, p.30 10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen

7. Review Problem #13, p.30 10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen
AREA AND PERIMETER OF A RECTANGLE

8. Review Problem #13, p.30
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen
L =
AREA AND PERIMETER OF A RECTANGLE
LENGTH ?

9. Review Problem #13, p.30
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10

10. Review Problem #13, p.30
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W =
W =
WIDTH ?

11. Review Problem #13, p.30
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6

12. Review Problem #13, p.30 L = 10 W = 6 A = 10 * 6 = 60
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
L * W
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6
A = 10 * 6 = 60

13. Review Problem #13, p.30 L = 10 W = 6 A = 10 * 6 = 60 P = 32
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
L * W
2 * L + 2 * W
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6
A = 10 * 6 = 60
P = 32

14. Review Problem #13, p.30 L = 10 W = 6 A = 10 * 6 = 60 P = 32
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
L * W
2 * L + 2 * W
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6
AREA PERIMETER
A = 10 * 6 = 60
P = 32

15. Review Problem #13, p.30 L = 10 W = 6 A = 10 * 6 = 60 P = 32
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
L * W
2 * L + 2 * W
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6
AREA PERIMETER
A = 10 * 6 = 60 60 32
P = 32

16. Review Problem #13, p.30 L = 10 W = 6 A = 10 * 6 = 60 P = 32
10 Print “AREA AND PERIMETER OF A RECTANGLE”
20 Input “LENGTH”;L
30 Input “WIDTH”;W
40 Let A = _____________
50 Let P = _____________
60 Print “AREA”, “PERIMETER”
70 Print A, P
80 END
L * W
2 * L + 2 * W
Computer Memory
Computer Screen
L = 10
AREA AND PERIMETER OF A RECTANGLE
LENGTH ? 10
W = 6
W =
WIDTH ? 6
AREA PERIMETER
A = 10 * 6 = 60 60 32
P = 32