1. Perimeter & Area
Geometry

2. Rectangle W
(width)
Perimeter
P=2l +2w
Area
A=lw l
(length)

3. Square
Perimeter
P=4s
Area
A=s2 S
(side)

4. Parallelogram
height
base
Perimeter
P=2l +2w
Area
A=bh

5. Triangle
Perimeter
P=a+b+c
Area
A= ½ bh a c h
(height) b
(base)

6. Trapezoid Perimeter= Add the distance of the sides
Base 1
height
height
(base 1 + base 2) 2
Base 2
Perimeter= Add the distance of the sides
Area= height(base 1 + base 2) 2

7. Circle
Diameter
d=2r
Circumference
C=2πr
Area
A=πr2
diameter
radius

8. 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
5 in
3 in

9. Ex: Find the perim. & area of the figure.
P=4s
P=4(20m)
P=80m
A=s2
A=(20m)2
A=400m2
20 m

10. Ex: Find the perim. & area of the figure.
P= 2(20in)+2(9in)
A= b x h
P=40in+18in
A= (20in)(8in)
P=58in
A= 160in2

11. 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
5 ft
4 ft
7 ft
6 ft

12. Ex: Find the perim. & area of the figure.
A= 10ft(12ft+15ft) 2
P= 11ft+12ft+11ft+15ft
P= 49 ft
A= 270ft 2
A= 135 ft

13. Ex: Find the circumference & area of the circle.
C=2πr
C=2π(5in)
C=10π in
C≈31.4 in
A=πr2
A=π(5in)2
A=25π in2
A≈78.5 in2
10in