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# Area & Perimeter

## on Apr 22, 2010

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A PowerPoint presentation of Perimeter & Area for 4th and 5th grade.

A PowerPoint presentation of Perimeter & Area for 4th and 5th grade.

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• Hello! I was just wondering about slide 4, the perimeter of a compound figure is sum of all sides, but of a rectangle is (lengthx2)+(widthx2). I don't have a problem with it but I wanted to show this to my 6th grade students and the math department has a strict policy about formulas. Anyway, it leads us to the same answer. Can I use this ppt for my students and just add the formula of a rectangle or would that be a problem? Thank you anyway and great job:)
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## Area & PerimeterPresentation Transcript

• PERIMETER & AREA
• Defining and calculating
• When your family puts up a new fence around your home, how will they know how much fencing they need? PERIMETER
• Perimeter
• The perimeter of a figure is the distance all the way around the figure.
• Perimeter
• The perimeter is found by adding the lengths of the sides together.
• Find the perimeter of the figures. A. B. D. C. P = 24 m P = 21 cm P = 39 mm P = 26 in.
• Perimeter of a Square
• A square is a figure with 4 equal sides.
• The perimeter can be found by adding all 4 sides together.
• It can also be found by multiplying the side length by 4.
• So the formula for the perimeter of a square is:
• P = 4s
• Find the perimeter of the squares using the formula P = 4s . A. B. D. C. P = 36 m P = 28 in. P = 44 mm P = 20 cm
• Perimeter of a Rectangle
• A rectangle is a figure with 4 sides. Opposite sides are equal.
• The perimeter can be found by adding all 4 sides together.
• It can also be found by adding twice the width together with twice the length.
• So the formula for the perimeter of a rectangle is:
• P = 2 w + 2 l
• Find the perimeter of the rectangles using the formula P = 2 w + 2 l . A. B. D. C. P = 30 cm P = 28 m P = 54 mm P = 28 in.
• If your parents want to put new carpet in your room, how will they know how much carpet to buy? AREA
• Area
• The area of a figure is the number of square units that cover the surface of the closed figure.
• Area
• A square unit is a unit that has 4 equal sides.
• For metric units, we say “units squared”. Ex: centimeters squared or cm 2
• For U.S. Customary, we say “square units” Ex: square inches or sq. in.
• Area
• The area of a figure is found by finding how many square units it takes to cover its surface.
• Find the area of the figures. A. B. D. C. A = 16 sq. units A = 27 sq. units A = 30 sq. units A = 8 sq. units
• Area of a Square
• The area of a square is found by finding how many square units it takes to cover its surface.
• It can also be found by multiplying its side length by its side length.
• Multiplying a number by itself is also called “squaring it”.
• So the formula for the area of a square is: A = s x s or A = s 2
• Find the area of the squares using the formula A = s 2 . A. B. D. C. A = 16 cm 2 A = 25 sq. in. A = 49 m 2 A = 81 sq. ft.
• Area of a Rectangle
• The area of a rectangle is found by finding how many square units it takes to cover its surface.
• It can also be found by multiplying its length by its width.
• So the formula for the area of a rectangle is: A = l x w
• Find the area of the rectangles using the formula A = l x w . A. B. D. C. A = 24 cm 2 A = 77 sq. in. A = 140 mm 2 A = 48 sq. ft.
• Check for understanding. Find the perimeter & area of the figure.
• The perimeter is the distance ____ _______________________. P = _____
• The area is the number of _____ ____ it takes to cover its ______. A = _____
all the way around a figure square units surface 28 m 48 m 2