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Mathematics 17 Online
OpenStudy (anonymous):

Find the sum of the measures of the interior angles of each convex polygon.

OpenStudy (anonymous):

overall

OpenStudy (anonymous):

Here is the question: 16-gon

OpenStudy (anonymous):

???

OpenStudy (anonymous):

i dont know

OpenStudy (anonymous):

It wants me to find the sum of a convex polygon and the polygon is a 16-gon

OpenStudy (anonymous):

& I can't seem to figure it out.

sam (.sam.):

Use the formula (n-2)*180

OpenStudy (anonymous):

Ok, So would it be 16 in place of the n?

sam (.sam.):

You will get 2520 degrees

OpenStudy (anonymous):

Ok, But what number would I put in place of the n?

sam (.sam.):

16

OpenStudy (anonymous):

Alright thanks man, Can ya help me with a couple of more?

sam (.sam.):

ok

OpenStudy (anonymous):

My next one is: The measure of the interior angles of a regular polygon is given. Find the number of sides in the polygon.

OpenStudy (anonymous):

Here is the question: 1980.

sam (.sam.):

Sum of the angles is 1980?

OpenStudy (anonymous):

I just got to find the polygon that has a number of sides of 1980.

OpenStudy (anonymous):

Thats basically what it is.

OpenStudy (anonymous):

..Sam, Can ya help?

sam (.sam.):

\[\frac{(n-2)\times180}{n}=\text{Each \angle inside the polygon}\] \[(n-2)\times180=\text{Sum of angles inside the polygon}\] ---------------------------------------------------------- So, \[(n-2)\times180=\text{Sum of angles inside the polygon}\] \[(n-2)\times180=1980\] n=13

OpenStudy (anonymous):

Alright thanks, Can ya help with 4 more lol? Sorry man

sam (.sam.):

post as a new question

OpenStudy (anonymous):

Alright, Give me a min

OpenStudy (anonymous):

The equation is (180)(n-2), where n is the number of sides. Here's why: |dw:1334620067825:dw| The number of triangles that I can split the polygon up into, is n-2. Each triangle's interior angles sum to 180. How cool! =D

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