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anonymous

  • one year ago

ABCD is a trapezoid with AD = 5 ft, DC = 7 ft, and AB = 15 ft. Find the area of the trapezoid. A.) 30 ft2 B.) 33 ft2 C.) 44 ft2 D.) 55 ft2

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  1. anonymous
    • one year ago
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    |dw:1435239996387:dw|

  2. anonymous
    • one year ago
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    i was thinking to multiply 7*5*15=525 cause you need to find the area then i was thinking maybe to add 7+5+15=27s so i did the easy way and did 5*7=35 so m thinking to estimate would be B is this good enough he for this one^?

  3. anonymous
    • one year ago
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    did his help enough ? this ones a little confusing but i got it (B)

  4. Vocaloid
    • one year ago
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    area of a trapezoid = (1/2)(base1 + base 2)*height base 1 is AB, which is 15 base 2 is DC, which is 7 we don't know the height, but we can find it if we recognize the triangle ADE

  5. Vocaloid
    • one year ago
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    |dw:1435240818264:dw|

  6. anonymous
    • one year ago
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    if u do 15*7=105 that's not an answer and if u try to do 5*15=75 so that wont work

  7. Vocaloid
    • one year ago
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    I'm not done explaining, please let me finish...

  8. Vocaloid
    • one year ago
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    |dw:1435240960751:dw|

  9. anonymous
    • one year ago
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    i was thinking (b) or (c) but you got to think if u do 15*7 or 5*15 it wont work then i did 5*7=35 so i went t the closest estimate and got 33 which is b

  10. Vocaloid
    • one year ago
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    alright, so we know that the bottom is 15 and the top is 7, right? we can see from the diagram that a+b = 15-7, and since a and b are equal, we know that 2a = 8, and a = 4

  11. Vocaloid
    • one year ago
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    |dw:1435241108023:dw|

  12. Vocaloid
    • one year ago
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    using the pythagorean theorem, we see that (height)^2 + 4^2 = 25, so the height is 3 now, going back to the original equation... height = 3 base 1 = 15 base 2 = 7 area of a trapezoid = (1/2)(base1 + base 2)*height

  13. Vocaloid
    • one year ago
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    it's usually better to calculate the exact answer, rather than estimating

  14. anonymous
    • one year ago
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    i actually used a calculator if u are trying to a smart one just letting u know :) i was making an expression nother word for something

  15. Vocaloid
    • one year ago
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    ^ that's not what I meant, what I meant was to actually use the correct formula instead of estimating the answer...

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