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