Finding Interior Angles

I will now help you find the interior angles of a particular shapes through the formula n (or the number of sides the shape has)-2(180) to find the length of sides take the answer and divide it by n (again the number of sides).

The person making this video goes a bit fast so I will explain it more in depth and then your welcome to watch the video.  I apologize for the low quality sound.

 He is looking at a pentagon.

A pentagon has five angles or points.  Count the edges to find out there are five.  Five edges means five angles.

So lets look at our formula n-2(180
n= the number of sides a pentagon has

We counted the angles so we know the pentagon has five sides so plug 5 in for n
5-2(180) 
3(180)

= 540°  (REMEMBER ONLY A PARALLELOGRAMS ANGLES/SIDES ADD UP TO 360°)

To find all the interior angles individually you need to take
540/n
n= the number of sides or 5 for the pentagon
540/5=  108° each

 To find an exterior angle you take your answer and minus it from 180° (YOU WILL SEE THIS IN THE VIDEO).  He extends lines from each side/point of the pentagon to find each exterior angle.

180° - 108° = 72°

He has one more example of a hexagon afterwards that I will leave for you to try with him and on your own.  If you have any questions feel free to comment.