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- 1. Geometry: Perimeter and Area
- 2. Can You Name the Shape?
- 3. Geometry: Perimeter and Area <ul><li>New Vocabulary: </li></ul><ul><li>Perimeter: The distance around a geometric figure. </li></ul><ul><li>Formula : An equation that shows a relationship among certain quantities. </li></ul><ul><li>Area: The measure of the surface enclosed by a figure. </li></ul>
- 4. Width <ul><li>Definition: </li></ul><ul><li>How wide a figure is from side to side. </li></ul>
- 5. Length <ul><li>Definition: </li></ul><ul><li>The measure of the distance across an figure. </li></ul>
- 6. Perimeter <ul><li>To calculate the perimeter of any shape, just add up “each” line segment of the “fence”. </li></ul>
- 7. Perimeter <ul><li>3 in </li></ul><ul><li>2 in </li></ul>2 in 3 in
- 8. Perimeter <ul><li>3 in </li></ul><ul><li>2 in </li></ul>2 in 3 in P= 2 + 3 + 2 + 3 = 10 in You can find the perimeter of a rectangle by adding all of the sides together.
- 9. Find the Perimeter Using a Formula
- 10. PERIMETER OF A RECTANGLE P=2l+2w
- 11. 2 in. 3 in. Perimeter of a Rectangle P=2l+2w P=2(3 in.) + 2 (2in.) P=6 in. + 4 in. P=10 in.
- 12. PERIMETER OF A TRIANGLE P=s +s +s 1 2 3
- 13. Perimeter of a Triangle P=s + s + s <ul><li>2 3 </li></ul>P=8cm+10cm+6cm P= 24 cm 8cm 6cm 10cm
- 14. Remember <ul><li>Squares ALL sides are equal…so if they give you one side, you know ALL the sides </li></ul><ul><li>Length=the Largest side </li></ul><ul><li>If they “leave” numbers out, they are equal to their opposite side. If they give you the bottom of a square/rectangle type shape then the top is the same </li></ul>
- 15. Finding area of an irregular figure <ul><li>Box the object in then count the length and the width of the “box”. </li></ul><ul><li>Example: </li></ul><ul><li>Length = 4 </li></ul><ul><li>Width = 5 </li></ul>
- 16. Find The Perimeter What is the perimeter of this figure?
- 17. Area Area is the amount of surface space that a flat object has. Area is reported in the amount of square units.
- 18. AREA <ul><li>Square units means that “that” many squares fit inside that shape (if measured in feet…it’s feet…if meters…it’s meters. In this example the area is 4 square units…note 4 squares fit) </li></ul>1 2 units (ft, in, m) 2 3 4
- 19. Count the number of blue squares to determine the area of that surface. The area is equal to 9 squares.
- 20. Area = 15 square feet What is the area of this surface if each square is equal to one foot? Count the number of squares. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
- 21. Two neighbors build swimming pools. This is what the pools look like. Which family has the pool with the bigger swimming area?
- 22. The area of Family A’s pool is 8 square units. The area of Family B’s pool is 7 square units. Therefore, Family A has the pool with the bigger swimming area.
- 23. Area of Squares/Rectangles <ul><li>Length x Width=Area </li></ul>2 Length(2) x Width(2) = 4 square units
- 24. Parallelogram Area <ul><li>Area=Base x Height </li></ul><ul><li>(Area=length x width) </li></ul>BASE (length) Height (width) 8 5 Base 8 x Height 5 = Area 40 The diagonal line is NOT the height!!!

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