Transcript No Slide Title

Perimeter - the
distance around a figure
4 cm
4 cm
6 cm
4 cm + 4 cm + 6 cm = 14 cm
Perimeter = 14 cm
You can find the
perimeter of any
polygon by adding
the lengths of all
its sides.
Find the
perimeter.
10 cm
1 cm
4 cm
3 cm
10 cm
4 cm
1 cm
3 cm + 10 cm + 1 cm + 4 cm +
4 cm + 1 cm + 10 cm = 33 cm
Perimeter = 33 cm
You can find the perimeter of
a regular polygon by
multiplying the length of one
side by the number of sides.
7 cm
7 cm x 6 = 42 cm
Perimeter = 42 cm
6 cm
6 cm x 5 = 30 cm
Perimeter = 30 cm
Remember: a regular polygon has
equal sides and equal angles
12 mm
8 cm
12 mm x 3 = 36 mm
8 cm x 4 = 32 cm
Perimeter = 36 mm
Perimeter = 32 mm
The perimeter (P) of a
rectangle equals 2 times the
sum of the length (l) and the
width (w).
10 cm
P = 2 x (l + w)
P = 2 x (10 + 5)
P = 2 x 15
P = 30 cm
5 cm
l = 10 cm
w = 5 cm
Area - measure of the
surface of a region in
square units.
Examples of Units
mm
cm
m
in
ft
yd
Square Units
mm x mm = mm2
cm x cm = cm2
m x m = m2
in x in = in2
ft x ft = ft2
yd x yd = yd2
You can use this formula to
find the area of a rectangle.
Area = length x width
A=lxw
A = 10 cm x 5 cm
A = 50
2
cm
The area is 50 cm2.
5 cm
width (w)
10 cm
length (l)
There is a special formula
for the area of a square.
(s = side)
A=sxs=
A=
2
s
2
s
5 cm
5 cm
A = 5 cm x 5 cm = 52 cm2
A = 25
2
cm
The area is 25 cm2.
You can use the base and height to
find the area of a right triangle.
Math Tip: The
height is always
perpendicular to the
base.
A = 1/2 x (b x h)
A = 1/2 x (6 x 4)
A = 1/2 x (24)
height (h)
4 in
base (b)
6 in
A = 12 in2
The area is 12 in2.
Remember: solve inside the parenthesis first
You can use the formula A = 1/2 x (b x h) to
find the area of any triangle.
Math Tip: The
height is always
perpendicular to the
base.
A = 1/2 x (b x h)
height (h)
10 cm
base (b) 4 cm
A = 1/2 x (4 x 10)
A = 1/2 x (40)
A = 20 cm2
The area is 20 cm2.
You can use a formula to find the area of
any parallelogram.
12 ft
A
A
D
height (h)
5 ft
B
Slide
P
D
12 ft
5 ft
C
ABP to
M
base (b)
12 ft
C
DCM You can use this
Area of rectangle APMD:
A = 12 ft x 5 ft
A = 60 ft2
B
formula to find the area
of a parallelogram:
A=bxh
A = 12 ft x 5 ft
A = 60 ft2