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mayrabris2cute

  • 3 years ago

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

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  1. mayrabris2cute
    • 3 years ago
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    plz help @cgreenwade2000

  2. mathstudent55
    • 3 years ago
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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?

  3. mayrabris2cute
    • 3 years ago
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    I know formula for the area of a circle....

  4. mathstudent55
    • 3 years ago
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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

  5. mayrabris2cute
    • 3 years ago
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    A = pi x r^2

  6. mathstudent55
    • 3 years ago
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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.

  7. mayrabris2cute
    • 3 years ago
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    I really need to hurry!!!! I can't in time!!!!!

  8. mayrabris2cute
    • 3 years ago
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    3.15 * 8 = 25.2

  9. mathstudent55
    • 3 years ago
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    |dw:1358454216136:dw|

  10. mayrabris2cute
    • 3 years ago
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    Oh no! I have to go! I'll just get the answer wrong :/

  11. mayrabris2cute
    • 3 years ago
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    Yes....

  12. mathstudent55
    • 3 years ago
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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.

  13. mayrabris2cute
    • 3 years ago
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    So 40 + 25.2 = 65.3. That's the answer?

  14. mayrabris2cute
    • 3 years ago
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    But 65.3 isn't an answer choice.

  15. mathstudent55
    • 3 years ago
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    40 + 25.1 = 65.1

  16. mathstudent55
    • 3 years ago
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    You got it! Good work.

  17. mayrabris2cute
    • 3 years ago
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    The answer is 6.1. I just did it and got it right!

  18. mayrabris2cute
    • 3 years ago
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    Alright! Thx! :D

  19. mathstudent55
    • 3 years ago
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    wlcm

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