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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
shaded part
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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