Perimeter and Area Review

What are these shapes called?

square rectangle

parallelogram

trapezoid

triangle

Perimeter is the “fence around the yard.” (measured in units: in., cm., ft., yds., mm., etc…)

How do we solve for perimeter?Add all sides together.

Example:

What is Perimeter?

5 in.

5 in.

5 in.

5 in.

5 in.

1. How do I find the perimeter of this figure?

2. Add 5+5+5+5+5.3. What is the

perimeter? 25in.

1. 2. 3.

4. 5.

Find the perimeter of these figures:

2 ft.2 ft.

3 ft.

6 cm

6 cm

4 cm

4 cm

5 in

5 in

3 in3 in

7 ft

5 ft

9 ft9 ft

12 yds.

12 yds.

12 yds.

12 yds.

48 yds.30 ft.

7 ft.

20 cm.

16 in

Area is the “grass in the yard.” (measured in units squared/ units²: in², cm², ft², yds², etc...)

How do we solve for area? (Hint: it depends on the shape.)Square/Rectangle/Parallelogram:

A=b·h

Example:

Let’s Talk About Area…

3 cm 27 cm²

9 cm 8 ft

5 ft6 ft 40 ft²

Triangle: A= (b·h)

2Example:

Area continued…

6 yds. 6 yds.

4 yds.

5 yds.

10 yds²

Trapezoid:A= (b1 + b2) ·h

2

Example:

Area Continued…

9 cm.

7 cm.

12 cm. 12 cm.10 cm.

80 cm.²

base 1

base 2

height

Find the area of the following figures:

7 ft.

5ft. 35 ft.²9 cm.

8 cm.7 cm. 63 cm.²

8 in.

10 in.40 in.²

8 yds.

12 yds.

6yds.

10 yds.

70 yds.²

Perimeter is the fence that goes all around,Area is the grass that’s on the playground,To get the perimeter you add up all the sides,To get the area you multiply.

Area of a square, rectangle, and parallelogram:A= b·h

Area of a triangle:A= b·h 2

Area of a trapezoid:A= (b1+b2)·h

2

Let’s Review