Area and Perimeter of Rectangles

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Area and Perimeter of Rectangles
MEASUREMENT
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Quick recall!
Look around you and spot objects that look like a
rectangle. Do you know how to find their area
and perimeter?
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Lesson Outline

• Area of a rectangle on a Grid
• Area vs. Perimeter
• Solving for the Area and Perimeter

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Learning Outcomes

• Determine the area of a rectangular figure on a
  grid
• Differentiate area and perimeter
• Solve word problems involving area and perimeter
  of a rectangle

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Rectangle
LENGTH

• Has 4 sides.
• Has 4 right angles.
• Parallel sides have equal measures.
• The sides of a rectangle are known as length and
  width.

WIDTH
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Area on a Grid
A grid has vertical and horizontal lines that
form a square. Each square measures 1 sq.
unit. Let's count how many squares the blue
rectangle covers.
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Area on a Grid
There are 35 squares. This means that the
rectangle has an area of 35 square units.
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Area vs. Perimeter
AREA
PERIMETER
Area
Perimeter
The amount of space inside a shape.
The total distance around the outside of a shape.
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Area vs. Perimeter
PERIMETER 2 (LENGTH WIDTH)
AREA length x width
Area
Perimeter
The area is the product of length and width. Area
is expressed in square units.
The perimeter is twice the sum of the length and
width. Perimeter is expressed in units.
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Example
Let's find the area and perimeter of this
basketball court.
Area
15M
Area length width Area 15 m 11 m Area
165 sq. cm
11M
Perimeter
Perimeter 2 (length width) Perimeter 2 (15
m 11 m) Perimeter 2 (26 m) Perimeter 52 m
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Mid-Discussion Break
What tasks require measuring the perimeter of a
rectangle?
In what real-life situations do you need to
measure the area of a rectangle?
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Applying Area and Perimeter
Work in pairs in solving the following word
problems.
Write your workings and answer here
Write your workings and answer here
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2
The rectangular field shown is 310 ft. long and
250 ft. wide. What is its area?
The window has a length of 160 cm and a width of
80 cm. What is its perimeter?
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Applying Area and Perimeter
P 2(160 cm 80 cm) P 2(240 cm) P 480
cm The window has a perimeter of 480 cm.
A 310 ft 250 ft A 77,500 sq. ft The
rectangular field has an area of 77,500 sq. ft
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2
The rectangular field shown is 310 ft. long and
250 ft. wide. What is its area?
The window has a length of 160 cm and a width of
80 cm. What is its perimeter?
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Area of Rectangle
A L W
Recap
Remember the following formulas in finding the
area and perimeter of a rectangle.
Perimeter of Rectangle
P 2 (LW)
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