Notes Over 3.2Equations and FormulasEquations and Formulas

When using a formula, you must first know what each variable represents.

Example

The formula for the area of a square is A = s2. What do A and s represent in this formula?

A represents the area of the squares represents the side of the square

Find the area of a square with sides of 6 centimeters. 2sA 2 A

636 2cm

Notes Over 3.2Equations and FormulasEquations and Formulas

1. The formula for the area of a rectangle is A = lw. What do A, l and w represent in this formula?

A represents the area of the rectanglel represents the length of the rectangle

2. Find the area of a rectangle with a length of 9 inches and a width of 7 inches.

lwA A

9

63 2in

w represents the width of the rectangle

7

Notes Over 3.2Equations and FormulasEquations and Formulas

3. The formula for the area of a parallelogram is A = bh. What do A, b and h represent in this formula?A represents the area of the parallelogramb represents the base of the parallelogram

4. Find the area of a parallelogram with a base of 13 millimeters and a height of 20 millimeters.

bhA A

13

260 2mm

h represents the height of the parallelogram

20

Notes Over 3.2Equations and FormulasEquations and Formulas

5. The formula for the distance traveled is D = rt. What do D, r and t represent in this formula?

D represents distancer represents rate

6. Find the distance traveled if the rate is 48 miles and the time is 2.5 hours.

rtD D

48

120 mi

t represents time

5.2

Notes Over 3.2Equations and FormulasEquations and Formulas

7. The formula for the perimeter of a rectangle is p = 2l + 2w. What do p, l and w represent in this formula? p represents perimeter

l represents length

8. Find the perimeter of a rectangle if the length is 16 centimeters and the width is 10 centimeters.

wlp 22 2 2 p

16

52 cm

w represents width

10

Notes Over 3.2

Extra Practice Worksheet 3.2

Pg. 3-14, Lesson 3.2 #5-30