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anonymous

  • 5 years ago

I need help please! with area of triangles

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  1. anonymous
    • 5 years ago
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    im bad at geometry!

  2. anonymous
    • 5 years ago
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    1/2 x Breadth x Height

  3. anonymous
    • 5 years ago
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    \[Area_{\Delta} = \frac{1}{2}Base \times Height\]

  4. anonymous
    • 5 years ago
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    i know. but i need help solving a question.!

  5. anonymous
    • 5 years ago
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    im sorry its base.

  6. anonymous
    • 5 years ago
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    post your question here!

  7. anonymous
    • 5 years ago
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    Breadth is a decent word for it

  8. anonymous
    • 5 years ago
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    ok hold on.

  9. anonymous
    • 5 years ago
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    use 1.7 as the value of square root 3. what is the area of equalateral triangle abc in sq. in

  10. anonymous
    • 5 years ago
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    what are the lengths of the sides of the triangle?

  11. anonymous
    • 5 years ago
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    here ill send a picture.

  12. anonymous
    • 5 years ago
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  13. anonymous
    • 5 years ago
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    Ok, so what is the length of the base?

  14. anonymous
    • 5 years ago
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    I don't know..

  15. anonymous
    • 5 years ago
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    its equilateral

  16. anonymous
    • 5 years ago
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    4?

  17. anonymous
    • 5 years ago
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    yes

  18. anonymous
    • 5 years ago
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    Ok.

  19. anonymous
    • 5 years ago
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    so now we need the height (the length of the blue line through the middle)

  20. anonymous
    • 5 years ago
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    how?

  21. anonymous
    • 5 years ago
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    pythagoras theorem

  22. anonymous
    • 5 years ago
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    Well, we have 2 right triangles described in the middle of that equalateral triangle.

  23. anonymous
    • 5 years ago
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    yes.

  24. anonymous
    • 5 years ago
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    \[2^{2} + x ^{2} = 4^{?}\]

  25. anonymous
    • 5 years ago
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    so the length of the hypotenuse of either of them is 4. and one leg is 2 (half of 4). What is the length of the other leg?

  26. anonymous
    • 5 years ago
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    its 2?

  27. anonymous
    • 5 years ago
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    \[x = \sqrt{4^{2}-2^{?}}\]

  28. anonymous
    • 5 years ago
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    which is sqrt of (16 - 4)

  29. anonymous
    • 5 years ago
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    which is sqrt 12.

  30. anonymous
    • 5 years ago
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    since sqrt 3 is given by 1.7

  31. anonymous
    • 5 years ago
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    yes,

  32. anonymous
    • 5 years ago
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    sqrt 12 = sqrt(4x3)

  33. anonymous
    • 5 years ago
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    sqrt(4x3) = 2x(sqrt3)

  34. anonymous
    • 5 years ago
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    which is 2x1.7 = 3.4, therefore the length is 3.4 and the base 4.

  35. anonymous
    • 5 years ago
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    using the formula 1/2 b h = 0.5 x 3.4 x 4.

  36. anonymous
    • 5 years ago
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    the answer is 6.8 inches

  37. anonymous
    • 5 years ago
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    are u sure

  38. anonymous
    • 5 years ago
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    this means you don't understand how it's done!

  39. anonymous
    • 5 years ago
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    the more important question is are YOU sure.

  40. anonymous
    • 5 years ago
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    Because if you aren't sure, then you have no way to know if holy did it right.

  41. anonymous
    • 5 years ago
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    yes.

  42. anonymous
    • 5 years ago
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    NO I UNDERSTAND! :) now.

  43. anonymous
    • 5 years ago
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    can u guys help me with one more like that?

  44. anonymous
    • 5 years ago
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    ?

  45. anonymous
    • 5 years ago
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  46. anonymous
    • 5 years ago
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    its the same question as the previous. if you understood you should be able to do this.

  47. anonymous
    • 5 years ago
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    since its an equilateral triangle. use the formula to get the length of the triangle.

  48. anonymous
    • 5 years ago
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    using the formula \[a ^{2} + b ^{2} = c ^{2}\]

  49. anonymous
    • 5 years ago
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    you can find out what is the height/length of the triangle.

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