Area and Perimeter

1
Area and Perimeter
2
Area of a Rectangle

• ALW
• Length times Width

• A20 12
• A240 cm2

Length
20 cm
width
12 cm
3
Area of a Square

• A s2
• A side to the second power

• A 62
• A 66
• A 36 ft2

side
6 feet
4
Area of Triangle
Height

• A ½bh
• A ½ b h

9.5 km

• A ½ 8 9.5
• A 0.5 8 9.5
• A 38 km2

Base (bottom)
8 km
5
Area of a Triangle                              
                                                  
                                 
A ½ 33 54 A 0.5 33 54 A 891 mm2
33 mm
54 mm
6
Area of Parallelograms
A bh A 5 3 A 15 m2
3 m
5 m
7
Area of Trapezoid

• A ½ h (b1 b2)

6 m
A ½ 14 (6 8)
14 m
A ½ 14 14
A 0.5 14 14
8 m
A 98 m2
8
Perimeter of Any Shape

• Add up all of the sides.

8 in
P 29 in
10 in
10 in
4 in
4 in
9 in
10 in
10 in
9 in
P 56 in
8 in
3 in
9
Perimeter of Rectangles and Squares
6 mm

• Rectangle
• P 2L 2W

16 mm
12 cm
P 2 16 2 6 P 32 12 P 44mm
12 cm

• Square
• P 4s

P 4 12 P 48 cm
10
Perimeter
Area

• Fencing
• Border
• Edging

• Carpet
• Tiles
• Painting