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anonymous

  • 5 years ago

A square pyramid has a lateral surface area of 20 square yards. If the slant height is 2 yards, what is the total surface area of the pyramid???

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  1. anonymous
    • 5 years ago
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    Lateral surface area is the sum of the areas of the sides (triangular) but not the base. So the 4 triangles' areas add up to 20. The slant height is the height of the triangular side (not the height of the pyramid -- see the difference?) So you know the area of each triangle (calculate) and you know the height of each triangle. Get the length of the base, then the area of the base, then finish up.

  2. anonymous
    • 5 years ago
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    BUt i dont get how to find the area and the base measurnments

  3. bahrom7893
    • 5 years ago
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    oh i can figure this out i think, workin on it

  4. anonymous
    • 5 years ago
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    k its due tommorow and its getting late sooo...

  5. bahrom7893
    • 5 years ago
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    k workin on it gimme about 10-20 mins

  6. anonymous
    • 5 years ago
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    Use the formula for area of triangle: 1/2 * base * height. Area is known, height is known, so you can calculate base. Okay? Come on, stop giving up. You can do this.

  7. bahrom7893
    • 5 years ago
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    5*5 = 25; the total area is 45

  8. bahrom7893
    • 5 years ago
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    is that answer correct?

  9. anonymous
    • 5 years ago
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    so the answer is 45??

  10. bahrom7893
    • 5 years ago
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    Yeah well according to my calculations, u wanna see what i did?

  11. bahrom7893
    • 5 years ago
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    leah go here: http://www.twiddla.com/493733 I will try explainin on a whiteboard

  12. bahrom7893
    • 5 years ago
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    leah can u copy and paste the link above? i will draw it out. easier for both of us

  13. anonymous
    • 5 years ago
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    Wait a sec i gotta go do somthing

  14. bahrom7893
    • 5 years ago
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    http://bahrom7893.files.wordpress.com/2011/02/solution-to-pyramid1.png?w=648 I uploaded the solution there

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