anonymous
  • anonymous
i'll medal and fan for some trig help :)
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
johnweldon1993
  • johnweldon1993
Whatcha need help with? :)
anonymous
  • anonymous
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
johnweldon1993
  • johnweldon1993
No problem...ask away ^_^

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anonymous
  • anonymous
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
johnweldon1993
  • johnweldon1993
Correct :) And since we know that a decagon has 10 sides, we just replace 'n' with 10 and evaluate
anonymous
  • anonymous
soooo (10-2)180 --> (8)180=1440?
johnweldon1993
  • johnweldon1993
Correct indeed :)
anonymous
  • anonymous
ok, i have a couple more questions is that ok? :)
johnweldon1993
  • johnweldon1993
of course :)
anonymous
  • anonymous
ok so if each exterior angle is 12 degrees, how many sides does the polygon have? I forget this formula :(
johnweldon1993
  • johnweldon1993
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 \[\large \frac{360}{\text{number of sides}} = \text{length of each side}\]
johnweldon1993
  • johnweldon1993
Did that make sense? :)
johnweldon1993
  • johnweldon1993
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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