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Couple Geometry Questions - Please Help!!

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Old 12-08-2001, 12:31 PM   #1
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Couple Geometry Questions - Please Help!!
(Mods, I'll move this to the HW soon, don't worry... I just need some help with it for now.)

Reviewing for midterms, I can't remember (and want to check) some of this stuff, please help me:

1) What are the sum of the measures of the exterior angles of a hexagon (6 sides)?
2) What are the sum of the measures of the exterior angles of a triangle (3 sides)?

Are they both 180 degreess? Are they both 360 degrees? Or are they different answers??

3) What is the sum of the measures of the interior angles of an octagon (8 sides)??
- Note: The sum of the interior angles of a triangle (3 sides) is 180 degrees. A quadrilateral (4 sides) is 360 degrees.

4) What is the measure of one interior angle of a decagon (10 sides)?
5) What is the measure of one interior angle of a hexagon (8 sides)?

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Old 12-08-2001, 12:40 PM   #2
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I think there is an equation for the measure of interior angles....(N-2) x 180 N=number of interior angles...
sum exterior angles always equal 360...I think...
Do you have your book Phil?
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Old 12-08-2001, 12:49 PM   #3
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questions 1 and 2 are both 360, coz you are just going round in a circle,
Question 3 is 1080
4 = 144
5= 135
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Old 12-08-2001, 12:58 PM   #4
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oh yeah and bleachedrhino's equation thingy is correct
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Old 12-08-2001, 01:08 PM   #5
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Nope, I dont have my book... thats why I'm asking


Ok, the sum of the exterior angles is always 360.

How do you find ONE exterior angle of a regular shape?

Also, how do you find ONE interior angle of a regular shape?
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Old 12-08-2001, 01:12 PM   #6
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1. one extirior angle of a shape is 360/the number of angles i think.

2. 180-(360/number of sides)
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Old 12-08-2001, 01:13 PM   #7
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That sounds right. Thanks ALOT!
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Old 12-08-2001, 01:14 PM   #8
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Wait no..
I think your #2 is wrong...
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Old 12-08-2001, 01:15 PM   #9
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Ok phil....to find one exterior of a Regular shape--> 180 minus one interior angle
To find one interior angle--> use my equation (N-2) x 180 to find the sum of the interior angles. After you find the sum of the interior angles, divide by the number of interior angles.
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Old 12-08-2001, 01:19 PM   #10
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no phill, i think i'm right
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Old 12-08-2001, 01:19 PM   #11
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I'm not understanding what yall are saying..

Correct me here what is wrong:

The sum of the exterior angles is always 360.
To find one exterior angle, divide 360 by the number of sides.

The sum of the interior angles is 180 * (sides-2)
To find on interior angle, divide the sum of the interior angles by the number of sides.


Are those all correct? So, the only equation I need to know is 180 * (n-2)????
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Old 12-08-2001, 01:21 PM   #12
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Quote:
Originally posted by Oddjob
no phill, i think i'm right
Yeah, maybe you are.
But is the above post of mine all correct?
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Old 12-08-2001, 01:24 PM   #13
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yeah....that sounds right to me!
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Old 12-08-2001, 01:42 PM   #14
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ahh.....geometry.....my love.....man...i miss it so much....stupid precalc and alg II
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Old 12-08-2001, 01:58 PM   #15
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Quote:
Originally posted by bleachedrhino
yeah....that sounds right to me!
Okay, thanks.

I'm moving and closing this. If anyone thinks I am wrong, email me (fillup07@hotmail.com) ...
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