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Compare Rectangle Area and Perimeter

In this topic, we will be calculating the area and perimeter of rectangles.

Rectangle
A rectangle is a four-sided polygon where the opposite sides are equal in length.

Area
Area (A) is the number of square units it takes to cover the surface of a shape. Area is expressed in square units such as cm2, in2, or ft2.
In the diagram below, the
of the rectangle is the area.

Perimeter
Perimeter (P) is the distance around a closed, flat figure. Perimeter is expressed in units such as yd, mm, or mi.
The perimeter of a rectangle is the sum of its four sides.
In the diagram below, the blue border is the perimeter of the rectangle.

l = length
w = width
A = area
P = perimeter

 Area = length × width A = l w Perimeter = l + l + w + w P = 2 (l + w)

Example 1:

Find the area. Answer with proper units. To represent m 2, use "sq m". Sample answer:5 sq m.
 Area of either Rectangle= Perimeter of Black Rectangle= Perimeter of Green Rectangle=
Black Rectangle Green Rectangle
A r e a
A = l w A = l w
= (3 cm)(4 cm)   = (2 cm)(6 cm)
= 12 cm2   = 12 cm2
P e r i m e t e r
P = 2 (l + w) P = 2 (l + w)
= 2 (3 cm + 4 cm)   = 2 (2 cm + 6 cm)
= 2 (7 cm)   = 2 (8 cm)
= 14 cm   = 16 cm

 The answer is Area of either Rectangle= Perimeter of Black Rectangle= Perimeter of Green Rectangle=

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