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Warm up

Warm up. What is the perimeter of the rectangle? 40.2 cm B. 65.2 cm C. 80.4 cm D. 55.4 cm What is the area of the rectangle? 360.0 cm 2 B. 370.0 cm 2 C. 380.0 cm 2 D. 390.0 cm 2. 15.2 cm. 25 cm. What is the perimeter of the triangle? 4.8 cm B. 48 cm

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Warm up

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  1. Warm up • What is the perimeter of the rectangle? • 40.2 cm B. 65.2 cm • C. 80.4 cm D. 55.4 cm • What is the area of the rectangle? • 360.0 cm2 B. 370.0 cm2 • C. 380.0 cm2 D. 390.0 cm2 15.2 cm 25 cm • What is the perimeter of the triangle? • 4.8 cm B. 48 cm • C. 47.5 cm D. 48.5 cm • What is the area of the triangle? • 150.0 cm2 B. 105.0 cm2 • C. 115.0 cm2 D. 125.0 cm2 17.5 cm 10.5 cm 20 cm

  2. Warm up • What is the perimeter of the rectangle? • 40.2 cm B. 65.2 cm • C. 80.4 cm D. 55.4 cm • What is the area of the rectangle? • 360.0 cm2 B. 370.0 cm2 • C. 380.0 cm2 D. 390.0 cm2 15.2 cm 25 cm • What is the perimeter of the triangle? • 47 cm B. 48 cm • C. 47.5 cm D. 48.5 cm • What is the area of the triangle? • 150.0 cm2 B. 105.0 cm2 • C. 115.0 cm2 D. 125.0 cm2 17.5 cm 10.5 cm 20 cm

  3. What is the perimeter of the rectangle? Formula = 2l + 2w or 2 (l + w) 15.2 25 30.4 x 2x2 + 50.0 30.4 50 80.4 15.2 cm 25 cm Answer

  4. What is the area of the rectangle? Formula = l x w 15.2 x 25 Ignore the decimals and 760 multiply just like they are +3040 whole numbers 15.2 cm 25 cm

  5. What is the area of the rectangle? Formula = l x w 15.2 x 25 760 +3040 add the products 3800 15.2 cm 25 cm

  6. What is the area of the rectangle? Formula = l x w 15.2 Count the number of places x 25to the right of the decimal. 760 +3040 3800 15.2 cm 25 cm

  7. What is the area of the rectangle? Formula = l x w 15.2 one place x 25 760 +3040 380.0 Add it back into the answer. 15.2 cm 25 cm

  8. What is the perimeter of this triangle? Formula: Side “a” + Side “b” + Side “c” 10.5 17.5 +20.0 48.0 cm 17.5 cm 10.5 cm 20 cm

  9. What is the area of the triangle? Formula = ½ base x height 10.0 X10.5 Ignore the decimals and multiply just like they are whole numbers. ½ the base ( 20 divided by 2) 10.5 cm 20 cm

  10. Formula = ½ base x height 10.0 X 10.5 500 0000 +10000Add the products 10.5 cm 20 cm

  11. Formula = ½ base x height 10.0Count the number of X 10.5places to the right of the 500 decimal. 0000 +10000 10500 10.5 cm 20 cm

  12. What is the perimeter and area of the triangle? Formula = ½ base x height 10.0 Two places X 10.5 500 0000 +10000Add the places back into 105.00 cm2the answer. 10.5 cm 20 cm

  13. Vocabulary • Area: The measure of the amount of surface enclosed by the boundary of a figure. • Perimeter: The measure of the distance around a figure.

  14. If we are asked to find the area of the surface of a lake and the length of the shoreline, what are some ways we might be able to do this? Warrior Lake

  15. Turn to page 71 of the Covering and Surrounding section of your textbook.

  16. What does the scale on the bottom right tell you?

  17. Summarize • Explain how you found the perimeter of the lakes. • Why are the measurements slightly different? • Explain strategies you used to find the area. • What did you do with the parts of squares?

  18. Homework starts on page 78 • Core: 1, 3, 47 • Applications 2, 4

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