1. Finding Perimeter and Area
EXAMPLE 1
Finding Perimeter and Area
Find the perimeter and area of the rectangle.
SOLUTION
Find the perimeter.
P = 2l + 2w
Write formula.
= 2 ( 8 ) + 2( 5 )
Substitute.
= 26
Multiply, then add.

2. Finding Perimeter and Area
EXAMPLE 1
Finding Perimeter and Area
Find the area.
A = lw
Write formula.
( 8 )( 5 ) =
Substitute.
= 40
Multiply.
ANSWER
The perimeter is 26 feet, and the area is 40 square feet.

3. Find the side length of a square with an area of 81 square feet.
EXAMPLE 2
Finding Side Length
Find the side length of a square with an area of 81 square feet.
A = s2
Write formula for area of a square.
81= s2
Substitute 81 for A.
9 = s
Use mental math: 92 = 81.
ANSWER
The side length of the square is 9 feet.

4. Using the Distance Formula
EXAMPLE 3
Using the Distance Formula
Rabbits
A rabbit is running at a rate of 26.4 feet per second. How far does the rabbit travel in 5 seconds?
SOLUTION
d = r t
Write distance formula. =
Substitute 26.4 for r and 5 for t.
= 132
Multiply.
ANSWER
The rabbit travels 132 feet in 5 seconds.

5. Find the perimeter and area of the figure.
GUIDED PRACTICE
for Examples 1, 2 and 3
Find the perimeter and area of the figure.
1. rectangle: l = 25 in., w = 14 in.
SOLUTION
P = 2l + 2w
Write formula.
= 2 ( 25 ) + 2( 14 )
Substitute.
= 78 in.
Multiply, then add.
A = lw
Write formula.
( 25 )( 14 ) =
Substitute.
= 350 in.2
Multiply.

6. Find the perimeter and area of the figure.
GUIDED PRACTICE
for Examples 1, 2 and 3
Find the perimeter and area of the figure.
2. square: s = 7 in.
SOLUTION
P = 2l + 2w
Write formula.
= 2 ( 7) + 2( 7)
Substitute.
= 28 in.
Multiply, then add.
A = lw
Write formula.
( 7 )( 7) =
Substitute.
= 49 in.2
Multiply.

7. Find the side length of the figure.
GUIDED PRACTICE
for Examples 1, 2 and 3
Find the side length of the figure.
3. rectangle: A = 91 cm2, l = 13 cm, w = ?
A = lw
Write formula for area of a rectangle.
91= 13w
Substitute 91 for A.
7 = w

8. Find the side length of the figure.
GUIDED PRACTICE
for Examples 1, 2 and 3
Find the side length of the figure.
4. square: A = 100 yd2, s = ?
A = s2
Write formula for area of a square.
100= s2
Substitute 100 for A.
10 = s

9. 5. Distance How far does a car travel in 2 hours at a
GUIDED PRACTICE
for Examples 1, 2 and 3
5. Distance How far does a car travel in 2 hours at a
rate of 40 mi/h?
D = st
Write formula for distance. =
Substitute 40 for speed and 2 for time.
= 80
ANSWER
The car can travel 80 mi in 2 hours at a
Rate of 40
mi/h

10. Standardized Test Practice
EXAMPLE 4
Standardized Test Practice
SOLUTION
t = d r
Write distance formula.
264 22 =
Substitute 264 for d and 22 for r.
= 12
Divide.
ANSWER
It will take a rabbit 12 seconds to travel 264 feet. The correct answer is B.

11. 6. Running Speeds How fast is a rabbit running if
GUIDED PRACTICE
for Example 4
6. Running Speeds How fast is a rabbit running if
it travels 192 feet in 8 seconds?
SOLUTION
t = d r
Write distance formula.
192 8 =
Substitute 192 for d and 8 for r.
= 24
Divide.
ANSWER
The rabbit is running 24 feet per second.