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anonymous

  • one year ago

i'll medal and fan for some trig help :)

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  1. johnweldon1993
    • one year ago
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    Whatcha need help with? :)

  2. anonymous
    • one year ago
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    hi! @johnweldon1993 I'm reviewing for my final for my summer course but misplaced my notes on internal and external angles and have a couple questions about it

  3. johnweldon1993
    • one year ago
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    No problem...ask away ^_^

  4. anonymous
    • one year ago
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    so im trying to find the sum of interior angles of a decagon, and if im remembering correctly, the formula is (n-2)180 n being the number of sides

  5. johnweldon1993
    • one year ago
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    Correct :) And since we know that a decagon has 10 sides, we just replace 'n' with 10 and evaluate

  6. anonymous
    • one year ago
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    soooo (10-2)180 --> (8)180=1440?

  7. johnweldon1993
    • one year ago
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    Correct indeed :)

  8. anonymous
    • one year ago
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    ok, i have a couple more questions is that ok? :)

  9. johnweldon1993
    • one year ago
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    of course :)

  10. anonymous
    • one year ago
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    ok so if each exterior angle is 12 degrees, how many sides does the polygon have? I forget this formula :(

  11. johnweldon1993
    • one year ago
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    Well we can remember the formula in the sense that ALL polygons have exterior angles that add to 360 So in order to find out how many sides we can use the fact that \[\large \frac{360}{\text{number of sides}} = \text{length of each side}\]

  12. johnweldon1993
    • one year ago
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    Did that make sense? :)

  13. johnweldon1993
    • one year ago
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    Sorry, should have said "measure of each exterior angle" as opposed to "length of each side" kinda confusing context there...sorry about that

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