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.

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) (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) (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.
RELATED QUESTIONS
i need sum help on my math we are learning inequalities right now with greater than and... (answered by stanbon)
Hello I am doing my homework and I need some help with this one question, What is the... (answered by Alan3354)
I have a 64% in math. What grade do i need to get on my final which is 20% of my grade,... (answered by scott8148)
If i have a 67% in math what do i need to get on the eoct that is worth 20% of my grade... (answered by SmithWillSuffice)
I really Need Help With My Grade 9 Algebraic Equations and its for 20 points in every... (answered by richwmiller)
If I have an average of a 72 and I will take a test that's worth 20%. What grade do I... (answered by richwmiller)
I am in college Prealgebra and Introductory Algebra. This Greek to me and I seriously... (answered by irla,ewatrrr,lenny460)
I have a 75% in my math class (overall score) and my final is worth 20% of that. To pass... (answered by Alan3354)
Hi, my name is Kyle, im having dificulty in math, here are some of my questions, about... (answered by longjonsilver)