OpenStudy (kayla2001):

find the sum of the interior angles of a nonagon. a. 140 degrees b. 1,620 degrees c. 1,260 degrees d. 1,450 degrees

2 years ago
OpenStudy (igreen):

Use the formula: \(180(n - 2)\) Where '2' is the number of sides.

2 years ago
OpenStudy (igreen):

First of all, do you know how many sides a nonagon has?

2 years ago
OpenStudy (kayla2001):

nope

2 years ago
OpenStudy (igreen):

Google it..

2 years ago
OpenStudy (anonymous):

nonagon is a pentagon with 9 sides, just use igreens formula

2 years ago
OpenStudy (kayla2001):

so I change the 2 to 9?

2 years ago
OpenStudy (igreen):

^^^^^^^^^^^^^^^^

2 years ago
OpenStudy (igreen):

No, we don't change '2'.. 'n' is the number of sides..and since it has 9 sides, we replace 'n' with 9.

2 years ago
OpenStudy (igreen):

Oh I messed up and said '2' is the number of sides..sorry xD

2 years ago
OpenStudy (anonymous):

Plug in 9 for n

2 years ago
OpenStudy (kayla2001):

so its c

2 years ago
OpenStudy (igreen):

\(\color{blue}{\text{Originally Posted by}}\) @iGreen Use the formula: \(180(n - 2)\) ***Where '2' is the number of sides.*** \(\color{blue}{\text{End of Quote}}\) No, that part is incorrect :P

2 years ago
OpenStudy (anonymous):

Yes, I realized what you meant after :p

2 years ago
OpenStudy (igreen):

Yep, 1260 is correct.

2 years ago
OpenStudy (anonymous):

Yup, that's good!

2 years ago