SHAPES AND FIGURES OF PLANE GEOMETRY
Geometry
Example:
Calculate the area and perimeter of a rectangle with w = 5´ and l = 6´. Be sure to include
units in your answer.
Solution:
A = lw
P = 2l + 2w
A = (5)(6)
P = 2(5) + 2(6)
A = 30 square feet
P = 10 + 12
P = 22 feet
A square is a rectangle having four equal sides, as shown in
Figure 12 Square
Figure 12.
The area of a square is calculated using the following formula:
A = a2
(3-7)
The perimeter of a square is calculated using the following
formula:
A = 4a
(3-8)
The area of a square is always expressed in square units, and the perimeter of a square is always
expressed in the original units.
Example:
Calculate the area and perimeter of a square with a = 5´. Be sure to include units in your
answer.
Solution:
A = a2
P = 4a
A = (5)(5)
P = 4(5)
A = 25 square feet
P = 20 feet
MA-03
Page 10
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