Remember your prefixes! They help a lot, because there is a formula for this particular problem. Nonagon refers to a shape with 9 sides.
The number of triangles a polygon has is represented by the formula:
(n-2)
Where "n" is the number of sides. If you ever forget what you subtract "n" by think of a triangle. It has 3 sides, so it is only logical that you should only have 1 triangle (subtract by 2). So, what is the sum of the interior angles of a triangle, 180°. So the formula looks like this:
Sum of Interior Angles = 180°(n-2)
180°(9-2)
180°(7) = 1260° is the sum of interior angles for a nonagon!
170
1152
I also put this on your last post
Hello
a=2, b=7, c= -30
ac=-60
-60= 12*(-5)
We can see that 12*(-5)=ac and 12-5=b=7
So
Thanks
First of all, for median, <em>list the numbers in order.</em>
60, 60, 66, 70
If there are an odd number of numbers, the median is the number in the middle.
If there are an even number of numbers, the median is the average(mean) of the two numbers closest to the middle.
Average of 60 and 66:
60+66 = 126
126/2 = 63
Median: 63
