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alainabbyboo22

  • 2 years ago

Find the surface area of the figure below. A. 200 in2 B. 88 in2 C. 42.5 in2 D. 85 in2

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  1. alainabbyboo22
    • 2 years ago
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  2. alainabbyboo22
    • 2 years ago
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    am i doing the same thing as on the circle one ?

  3. JakeV8
    • 2 years ago
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    Pretty much... no circles here though ;) You're the teacher here... what should we do first? (jk, I'll help)

  4. alainabbyboo22
    • 2 years ago
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    lol i'd hope so ! cause otherwise i'll never be able to be the teacher . xD

  5. alainabbyboo22
    • 2 years ago
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    pi * 9^2 ?

  6. JakeV8
    • 2 years ago
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    Why pi? I don't see any circles in that diagram. What shapes are there?

  7. alainabbyboo22
    • 2 years ago
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    oh .. well .. 9*4*4 ?

  8. JakeV8
    • 2 years ago
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    I don't understand yet ;) It looks like you multiplied 9 * 4. Is that the area of a side of the shape?

  9. alainabbyboo22
    • 2 years ago
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    i really don't understand this one . i have no idea what i have to do . ):

  10. JakeV8
    • 2 years ago
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    What shape do you see on the sides of that pyramid?

  11. alainabbyboo22
    • 2 years ago
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    triangles .

  12. JakeV8
    • 2 years ago
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    Area of a triangle: = 1/2 * base * height You had the right idea of multiplying by four, though... there are four sides.

  13. JakeV8
    • 2 years ago
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    So, for the four triangle sides, your area of each side will be 1/2 * 4 * 9 1/2 * 4 * 9 = 18 And there are 4 of those triangle sides, so 4 * 18 = 72 But you still need to add the area of the square base.

  14. alainabbyboo22
    • 2 years ago
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    where do i go from there then ?

  15. JakeV8
    • 2 years ago
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    what is the area of the bottom? The shape of the bottom is a square with sides 4...

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