1. By Ashley McCaw

2. Mrs. Burk’s Perimeter Rap http://www.teachertube.com /view_video.php?viewkey=73 4fe93831e3fb400ce8www.teachertube.com /view_video.php?viewkey=73 4fe93831e3fb400ce8

3. What is Perimeter? Perimeter of a polygon is the distance around the outside of the polygon Measured in linear units and is one dimensional Each polygon has its own formula to find perimeter Can be measured in feet, inches, yards, miles, or any other unit

4. Shapes to Discuss Squares Rectangles Triangles

5. Perimeter of a Square Can be determined by adding all four sides of the square together Since a square has four equal length sides, you can use the formula Perimeter= 4*(length of one side) Example: P= 4*2 inches =8 inches

6. How Can We Remember Perimeter of a Square? http://www.teachertube.com/ view_video.php?viewkey=65d fbe56646110c37192 http://www.teachertube.com/ view_video.php?viewkey=65d fbe56646110c37192

7. Perimeter of a Rectangle Can be determined by adding all four sides together Since a rectangle has two sets of equal length sides, you can use the formula: P=2*length + 2* width Example: P = 2(8cm)+2(3cm) = 16cm+6cm = 22cm

8. Perimeter of a Triangle Can be determined by adding all three side lengths together Example: P=9cm+5cm+11cm =25 cm Special Case: If the triangle is equilateral (3 equal sides), then use the formula: P=3(length of a side)

9. What is Area? Area is a quantity expressing the size of a defined part of a surface, typically a region bounded by a closed curve. Is measured in square units and is two dimensional Each polygon has its own formula to find area Can be measured in feet 2, inches 2, or any other units 2

10. Shapes to Discuss Rectangles Triangles Circles

11. Area of a Rectangle Area = base * height Example: A = 5 * 4 =20 units 2 Squares are special rectangles, in which case you can use the formula: A = base 2 or A = height 2 5 units 4 units

12. Finding Area of a Square? http://www.mathopenref.co m/squarearea.htmlwww.mathopenref.co m/squarearea.html

13. Area of a Triangle Area= ½ base * height Triangles are ½ the size of a square, and therefore, the formula is base * height * ½ Example: A = ½ (7)(12) = ½ (84) =42 units 2

14. Area of a Circle A = pi * r 2 Pi is equal to approx. 3.14 r is the radius of the circle, or the distance from the center point to any point on the edge of the circle Example: A = 3.14 * (3 in) 2 = 3.14 * 9 in 2 = 28.26 in 2

15. Websites for Additional Info… http://www.mathleague.com/help/geometry/area.htm http://www.kidsnewsroom.org/elmer/infocentral/geo metry/Perimeter.html http://www.kidsnewsroom.org/elmer/infocentral/geo metry/Perimeter.html http://www.funbrain.com/poly/index.html http://math.about.com/od/formulas/ss/areaperimeter.htm http://math.about.com/od/formulas/ss/areaperimeter.htm