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Perimeter & AreaPerimeter & Area
GeometryGeometry
RectangleRectangle
• Perimeter
P=2l +2w
• Area
A=lw
l
(length)
W
(width)
SquareSquare
• Perimeter
P=4s
• Area
A=s2
S
(side)
ParallelogramParallelogram
PerimeterP=2l +2w
AreaA=bh
base
height
TriangleTriangle
• Perimeter
P=a+b+c
• Area
A= ½ bh
b
(base)
h
(height)
a c
TrapezoidTrapezoid
Perimeter= Add the distance of the sides
Area= height(base 1 + base 2) 2
Base 1
Base 2
heightheight
(base 1 + base 2)2
Example: Find the perim. & area of the figure.Example: Find the perim. & area of the figure.
• P=2l +2w P=2(5in)+2(3in)
P=10in+6in
P=16in
• A=lw A=(5in)(3in)
A=15in2
3 in
5 in
Ex: Find the perim. & area of the figure.Ex: Find the perim. & area of the figure.
• P=4s
P=4(20m)
P=80m
• A=s2
A=(20m)2
A=400m2
20 m
Ex: Find the perim. & area of Ex: Find the perim. & area of the figure.the figure.
20 in
8 in9 in
P= 2(20in)+2(9in)
P=40in+18in
P=58in
A= b x h
A= (20in)(8in)
A= 160in2
Ex: Find the perim. & area of the figure.Ex: Find the perim. & area of the figure.• P=a+b+c
P=5ft+7ft+6ft
P=18 ft
• A= ½ bh
A= ½ (7ft)(4ft)
A= ½ (28ft2)
A= 14ft2
7 ft7 ft
5 ft5 ft
4 ft4 ft
6 ft6 ft
Ex: Find the perim. & area of Ex: Find the perim. & area of the figure.the figure.
12 ft
15 ft
10 ft11 ft 11 ft
P= 11ft+12ft+11ft+15ft
P= 49 ft
A= 10ft(12ft+15ft) 2
A= 270ft 2A= 135 ft
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