Name:
Area of a Rectangle
To find the area of a rectangle, use the formula length x width = area.
This formula is often written as l x w = A.
10 cm
8 cm
The rectangle pictured here has a length of 10 cm and a width of 8 cm.
l = 10 cm
w = 8 cm
10 cm x 8 cm = 80 cm2
Note that the area’s unit is written as cm2.
This is said as “square centimeters” or “centimeters squared”.
Find the area of each rectangle.
b.
2
c.
ft
2
7 1
ft
0.25
cm
2.5 cm
12 1
1.8 km
a.
2.0 km
2
e.
1
in.
f.
mm
6
3
4 4
3.5
d.
mi
30.
0m
m
5 mi
Challenge: Find the area of the polygon. All corners are 90°. Use the back if you need work
space.
0.4 m
1.0 m
0.6 m
0.4 m
0.4 m
1.6 m
2.4 m
0.4 m
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ANSWER KEY
Area of a Rectangle
To find the area of a rectangle, use the formula length x width = area.
This formula is often written as l x w = A.
10 cm
8 cm
The rectangle pictured here has a length of 10 cm and a width of 8 cm.
l = 10 cm
w = 8 cm
10 cm x 8 cm = 80 cm2
Note that the area’s unit is written as cm2.
This is said as “square centimeters” or “centimeters squared”.
Find the area of each rectangle.
b.
2
c.
ft
2
7 1
ft
0.25
cm
2.5 cm
12 1
1.8 km
a.
2.0 km
93 3 in.2
0.625 cm2
2
e.
1
in.
f.
mm
6
3
4 4
3.5
d.
3.6 km2
4
mi
30.
0m
42 1 in.2
m
105 mm2
4
5 mi
23 3 mi2
4
Challenge: Find the area of the polygon. All corners are 90°. Use the back if you need work
space.
2
A
0.4 m
B
1.0 m
C
0.6 m
0.4 m
0.4 m
1.6 m
2.4 m
0.4 m
area of A = 2.4 x 1.6 = 3.84 m
area of B = 1.0 x 0.4 = - 0.40 m2
3.44 m2
area of C = 0.4 x 0.4 = + 0.16 m2
3.60 m2
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