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AcidRa1n

  • 2 years ago

Area of trapezoid

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  1. AcidRa1n
    • 2 years ago
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  2. AcidRa1n
    • 2 years ago
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    I know the answer is D

  3. AcidRa1n
    • 2 years ago
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    Its something with 45 30 90 or something that one angle on the left

  4. saifoo.khan
    • 2 years ago
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    \[\frac12\times base \times \text{(s um of p arallel sides)}\]

  5. AcidRa1n
    • 2 years ago
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    you use the 1/2h (b1+b2)

  6. saifoo.khan
    • 2 years ago
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    Yes.

  7. saifoo.khan
    • 2 years ago
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    But we have to find the value of the line adjacent with 45*/

  8. AcidRa1n
    • 2 years ago
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    Yeah how its something with 45 30 90 or something my teacher said i forgot

  9. saifoo.khan
    • 2 years ago
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    Use tan ratio to find it.

  10. saifoo.khan
    • 2 years ago
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    \[\tan \theta = \frac{opp}{adj}\] \[\tan 45 = \frac{7}{adj}\] \[adj = 7\]|dw:1330659614940:dw|

  11. saifoo.khan
    • 2 years ago
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    Now you have all the values, \[\frac12 * 7 * (8+8+3+7)\]Solve.:)

  12. AcidRa1n
    • 2 years ago
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    ohh its 7 why do you use tan?

  13. saifoo.khan
    • 2 years ago
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    Because we have to choose either one of the three ratios.. If you feel confusion, try writing the 2 other ratios as well.. And try applying them. Later you will find that u can't use those here.

  14. AcidRa1n
    • 2 years ago
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    oh alright thanks, got a big test tomorrow!

  15. saifoo.khan
    • 2 years ago
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    Best of luck. Believe me, i too used to get confused b/w which one to use.. then i found a shortcut. ;)

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