1. 1.7 Introduction to Perimeter, Circumference, & Area

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

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

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

5. Triangle Perimeter P=a+b+c Area A= ½ bh a c h (height) b (base)
The base and height are
ALWAYS perpendicular!!!!

6. 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

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

8. 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

9. 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