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Finding Area and Perimeter of Polygons. Area. Definition : The number of square units needed to cover a surface. (INSIDE) Length x width. Perimeter. Definition: The sum of the length of all the sides of a polygon. Base. Definition: A side or face of a figure on which the figure stands.

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## Finding Area and Perimeter of Polygons

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**Area**• Definition: • The number of square units needed to cover a surface. (INSIDE) • Length x width**Perimeter**• Definition: The sum of the length of all the sides of a polygon.**Base**• Definition: • A side or face of a figure on which the figure stands.**Height**• Definition: • The distance from the bottom to the top of a figure.**Width**• Definition: • How wide a figure is from side to side.**Length**• Definition: • The measure of the distance across an figure.**Finding area of an irregular figure**• Box the object in then count the length and the width of the “box”. • Example: • Length = 4 • Width = 5**Finding area of an irregular figure**Hint: Length x width=area What is the area of the box?**Finding area of an irregular figure**Hint: Length x width=area What is the area of the box? Right! 4x5=20**Finding area of an irregular figure**• How many squares are there in the box that are not shaded?**Finding area of an irregular figure**• How many squares are there in the box that are not shaded. • Right! • 6 squares**Finding area of an irregular figure**The area of the object is the area of the “box” (20) minus the squares that are are not shaded (6).**Finding area of an irregular figure**The area of the object is 20-6= 14 The area of the irregular figure is 14. *This method can be used instead of counting all the squares.**Finding perimeter of a figure**• Perimeter: distance around an object. • In this case the Box.**Finding perimeter of a figure**• For this figure the length is 4 and the width is 5. You have two 4’s and two 5’s. • The perimeter is • 2x4 + 2x5 = perimeter**Finding perimeter of a figure**• Multiply first, then add: • The perimeter is • 2x4 + 2x5 = perimeter • 8 + 10 =**Finding perimeter of a figure**• Multiply first, then add: • The perimeter is • 2x4 + 2x5 = perimeter • 8 + 10 = 18 • The perimeter of the box is 18.**Finding perimeter of a figure**18 is the perimeter of the box. So what? We want to know the perimeter of the figure.Do we know the perimeter of the figure?**Finding perimeter of a figure**• Yes, the perimeters are the same. • The blue is the perimeter of the figure. • The red is the perimeter of the box.**Finding perimeter of a figure**That trick does not work all the time. Sometimes you may have to count the side and add. What is the perimeter of this figure?**Finding perimeter of a figure**What is the perimeter of this figure?**Finding perimeter of a figure**Right 20! 10 on top and bottom 10 on the right and left**Now Go to:**www.shodor.org/interactivate/activities/perimeter/

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