SOLUTION: How many degrees are in a 20 sided figure?? would u take 180x180 20 times or what do I do?? I need some help on my math.' Thank you :) From Rosie Jenkins.

Algebra ->  Polygons -> SOLUTION: How many degrees are in a 20 sided figure?? would u take 180x180 20 times or what do I do?? I need some help on my math.' Thank you :) From Rosie Jenkins.       Log On


   

Question 603667: How many degrees are in a 20 sided figure?? would u take 180x180 20 times or what do I do?? I need some help on my math.'

Thank you :)
From Rosie Jenkins.
Found 2 solutions by Alan3354, stanbon:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How many degrees are in a 20 sided figure??
--------
The sum of interior angles is 180*(n-2)
= 180*18 = 3240 degs

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
sum of the interior angles of an n-sided convex polygon is (n-2)180 degrees
---
Your problem:
sum of interior angles = (20-2)*180 = 18*180 = 3240 degrees
==================
Try it with a smaller number of sides to see how it works.
3 sides: (3-2)180 = 180 ; that is a triangle
4 sides: (4-2)180 = 360 ; that could be a square
5 sides: (5-2)180 = 540 ; that could be a pentagon
etc.
===================
Cheers,
Stan H.