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mayrabris2cute Group Title

Find the area of the irregular shape. Round to the nearest tenth. PIC: http://www.mediafire.com/view/?67m8kuz77hcttep Answers: a. 90.2 cm² b. 241 cm² c. 65.1 cm² d. 72.3 cm²

  • one year ago
  • one year ago

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  1. mayrabris2cute Group Title
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    plz help @cgreenwade2000

    • one year ago
  2. mathstudent55 Group Title
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    You have an 8-cm by 5-cm rectangle plus a half circle with 4 cm radius. Do you know the folrmulas for the areas of a rectangle and a circle?

    • one year ago
  3. mayrabris2cute Group Title
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    I know formula for the area of a circle....

    • one year ago
  4. mathstudent55 Group Title
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    Ok, so you need half the area of a circle with radius 4 cm. The area of a rectangle is A = LW, where L = length and W = width

    • one year ago
  5. mayrabris2cute Group Title
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    A = pi x r^2

    • one year ago
  6. mathstudent55 Group Title
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    Right. Calculate that and divide by 2 because you have only half a circle. Then add that to A = LW, with L = 8 cm and W = 5 cm, which is the area of the rectangle.

    • one year ago
  7. mayrabris2cute Group Title
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    I really need to hurry!!!! I can't in time!!!!!

    • one year ago
  8. mayrabris2cute Group Title
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    3.15 * 8 = 25.2

    • one year ago
  9. mathstudent55 Group Title
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    |dw:1358454216136:dw|

    • one year ago
  10. mayrabris2cute Group Title
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    Oh no! I have to go! I'll just get the answer wrong :/

    • one year ago
  11. mayrabris2cute Group Title
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    Yes....

    • one year ago
  12. mathstudent55 Group Title
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    That's good. You have the area of the half circle. Now you need to calculate the area of the rectangle and add the two areas.

    • one year ago
  13. mayrabris2cute Group Title
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    So 40 + 25.2 = 65.3. That's the answer?

    • one year ago
  14. mayrabris2cute Group Title
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    But 65.3 isn't an answer choice.

    • one year ago
  15. mathstudent55 Group Title
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    40 + 25.1 = 65.1

    • one year ago
  16. mathstudent55 Group Title
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    You got it! Good work.

    • one year ago
  17. mayrabris2cute Group Title
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    The answer is 6.1. I just did it and got it right!

    • one year ago
  18. mayrabris2cute Group Title
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    Alright! Thx! :D

    • one year ago
  19. mathstudent55 Group Title
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    wlcm

    • one year ago
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