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The Area of a figure is the number of square units needed to cover it.

A = 2 3 6 square units

6 units2

2

3

Rectangle

45

A l w A 5 4

220 un

2A = s

8m 8m

A 8 8 264 m

Square

#1


#2

PERIMETER: Is the distance around a figure.

in + in + in + in = in

AREA: Is the square units that cover a figure.

length • width = in • in = in2

VOLUME: The number of cubic units inside a figure.

length • width • height in • in • in = in3

length

width

length width

height

squared

cubedcopyright©amberpasillas2010


Area of a Parallelogram

# 3

5 in

3 inA = b x h

A = 5 x 3 = 15 in2

To find the area for a parallelogram use what you know about area of a rectangle.

A = base x height


# 4 Area of a Triangle

8 m

6 m

A = 8 x 62

= 24 m2

A = base x height 2

A triangle is half the area of a rectangle. To find the area of a triangle you use the rectangle formula and divide it in half.

1A= bh

2

bhA=

2


# 5 Area of a Trapezoid

5 ft

4 ft

A = (b1 + b2) x h2

3 ft

A = (4 + 5) x 32

A = (9) x 3 2

272 = 13.5 ft2

A = (base1 + base2) x height 2

=


Area of Polygons#6


Rectangle

45

A l w

A 5 4

A un20 2

A b h

1078

A 10 7

A un70 2

Parallelogram Triangle

58

8 5A

2

A un20 2

7 b•hA=

2


6 in

= 3.14 or 22 7

#7

A = π radius squared2A = πr

2A = (3.14)6

A = (3.14) 36

2A = 113.04 in


#8

Find the Circumference

5 ft

Find the AreaC = 2 rC = 2 5

C = 31.42 ft

Round to the nearest hundredths place and include units!

2A = r2A = 5

A = 252A = 78.54 ft

C = 10


Parallelogram

Trapezoid

Triangle

Rectangle

A= Base x Height

A= (Base1 + Base2) x

Height

A= (Base x Height) h

b

A= Base x Height

h

b

2

2

Square A= Side x Sides

s

# 9

b1

b2

b

h

h


#10

20 m

12 m 13 m

Perimeter

Area1Area

P = 12 + 20 + 13 + 25

P = 70 m

5 m25m

2Area

Total Area

l w

b h2

20 12 2240 m

5 122 230 m

2270 mANOTHER WAY: Area of a Trapezoid

12(25 20)2 2270mA = (b1 + b2) x h

2


Perimeter & Area Review

# 11

The Area (A) of a figure is the number of square units needed to cover it.

The Perimeter (P) is the distance around a figure.

a

b

c P= a+b+c units

height

base

(h)(b)

A = 2 • 6

12 square units

12 units2

9 cm

5 cm 6 cm3 cm

Area & Perimeter of a Triangle

# 12

PerimeterP = a + b + c

P = 5 + 6 + 9

P = 20 cm

Area1A b h2

1A 9 32

1A 272

2A 13.5 cm

copyright©amberpasillas2010


#13 Perimeter & Area of a Rectangle The Perimeter of a figure is the distance around a figure.

2 in. 2 in.

5 in.

5 in.

2525+

14 in.

2 2P l w


A = 3 • 2

6 square units

6 units2

A b h 3

2


Teacher Note: The following study guide slides were taken from the lesson on Perimeter and Area review under the PERIMETER FOLDER


a

b

c

de

f

g

h P=a+b+c+d+e+f+g+h

a

b

cP= a+b+c

P=4ss

s

s

s

l

l

w w

P=2l+2w

#9


#10 Perimeter of a TrianglePerimeter: Distance around a geometric figure.

a 3 cm

c 7 cm

b 5 cm

P a b c

P 15 cmP 3 5 7

When you add thesides, you are alsoadding the units.

When you add units,your UNITS DO

NOTCHANGE!You must include units in every answer!


#11 Perimeter of a Rectangle & SquareThe Perimeter of a figure is the distance around a figure.

2 in. 2 in.

5 in.

5 in.

2525+

14 in.

Rectangle

45

2 2P l w

2(5) 2(4)P

18 units

4P s8 ft

8 ft

4(8)P 32 ft

Square

10 8


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