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Thread: Trigonometry

  1. 8th November 2015, 03:34 PM #1
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    Trigonometry

    Can anybody tell me how to calculate the length of this triangle? I've got all the sin cos tan tables . It's just that I don't know how to use them. It's more than half a century since I learnt this in school. Thank you. .W.
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  2. 8th November 2015, 03:42 PM #2
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    I used an app last time.....
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  3. 8th November 2015, 03:49 PM #3
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    3728?

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  4. 8th November 2015, 03:57 PM #4
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    Tan

    Find the length of the side ?:


    Step 1 The two sides we are using are Opposite (a)
    and Adjacent (7).
    Step 2 SOHCAHTOA tells us to use Tangent.
    Step 3 Write down the fraction for tan 11 deg = Opposite/Adjacent = ?/19184
    Step 4 Solve:
    Start with: tan 11 deg = ?/19184
    Swap: ?/19184 = tan 11 deg
    Calculate: ?/19184 = 0.19438030913
    Multiply both sides by 19184: ? = 0.19438030913 ? 19184
    ? = 3729 (rounded up)
    Side "?" = 3279
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  5. 8th November 2015, 05:03 PM #5
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    Thank you both Ron and Kelvin . I used the site Kelvin supplied and got 3729 (rounded) as the answer. Cheers .W.
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