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anonymous

  • one year ago

need help

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  1. anonymous
    • one year ago
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  2. mathstudent55
    • one year ago
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    The front and back faces are triangles. What6 is the area of a triangle with base 6 and height 2? |dw:1439845523581:dw|

  3. anonymous
    • one year ago
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    wow he fast

  4. mathstudent55
    • one year ago
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    Area of triangle = base * height / 2 What is 6 * 2 / 2 = ?

  5. anonymous
    • one year ago
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    6

  6. anonymous
    • one year ago
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    ?

  7. mathstudent55
    • one year ago
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    Correct. There are a front face and a back face, each with area 6, so from the front and back faces we have an area of 2 * 6 = 12

  8. mathstudent55
    • one year ago
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    Now we have three rectangles. The bottom rectangle has sides 2 and 6 What is the area of a rectangle with sides 2 and 6?

  9. mathstudent55
    • one year ago
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    |dw:1439846034210:dw|

  10. anonymous
    • one year ago
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    12

  11. mathstudent55
    • one year ago
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    Great. So far we have: Front & back faces 12 Bottom face 12 Now we need the right face. It's a rectangle 2 by 4. |dw:1439846273340:dw|

  12. anonymous
    • one year ago
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    8

  13. mathstudent55
    • one year ago
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    Great. So far we have: Front & back faces 12 Bottom face 12 Right face 8 One more face. The left face. It's a rectangle 3 by 2. |dw:1439846420666:dw|

  14. anonymous
    • one year ago
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    6

  15. mathstudent55
    • one year ago
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    Great again. Now we have: Front & back faces 12 Bottom face 12 Right face 8 Left face 6 --------------------- Total Add all the areas above to find the total surface area of the prism.

  16. anonymous
    • one year ago
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    76

  17. mathstudent55
    • one year ago
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    Somehow you double it. 12 + 12 + 8 + 6 = = 24 + 8 + 6 = 32 + 6 = 38

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