What is a polygon called if the sum of its interior angles equals
1440? a dod. dec. or oct?

Question

What is a polygon called if the sum of its interior angles equals 
1440?  a dod. dec. or oct?

mertsj · Answer

Divide 1440 by 180 to see how many triangles the polygon has.

mertsj · Answer

How many did you get?

anonymous · Answer

8

anonymous · Answer

180(n-2) = 1440
180n - 360 = 1440
180n = 1800
n = 10

Therefore, it's dec

mertsj · Answer

So the number of sides has to be 2 more than the number of triangles.  So how many sides does it have?

anonymous · Answer

petew said it alrdy

anonymous · Answer

Recall the formula: Total angle in polygon = 180(n-2)

mertsj · Answer

I saw that.  He ruined it for you.  Now we know that he can do the problem, but we are not so sure about you.

anonymous · Answer

I've given the steps to do the problem, all you need to do is understand them.

anonymous · Answer

no its fine i just really need to remember the definitions to this shapes the formula i wrote it down thx