Monday
July 28, 2014

Homework Help: math

Posted by Emily on Tuesday, March 27, 2007 at 8:46am.

The measure of an interior angle of a regular polygon is 135 degrees. Find the number of sides in the polygon. This is what I tried:

180(x-2)=135 [Interior Angle Sum Theorem]
x-2=.75
x=2.75

That can't be right though. Help?

Not sure about your formula.

Number of sides = 360/(180-interior angle)

so

Number of sides = 360/(180-135)
= 360/45
= 8


180(x-2) gives you the SUM of the interior angles, so each angle would be 180(x-2)/x

your equation would be

180(x-2)/x = 135

Sove it, you will get the answer DrRuss got.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

math--fast help please - Find the interior and exterior angle measurements of a ...
Geometry - In a regular polygon (equal sides and angles), you use (n-2)180 to ...
Algebra 2 - The formula A = 180(n-2)/n relates to the measure A of an interior ...
geometry - If the ratio of the interior angle to the exterior angle is 5:1 for a...
7th grade math Ms. Sue please - 2. Find the sum of the interior angles of a ...
Algebra II - 1. Find the value of 5 + 8 x 2 divided by 4 - 11 2. Evaluate (a-y...
Geometry - A regular polygon has an exterior angel measure of (x+3) Degrees and ...
geometry - 1. An exterior angle of a regular polygon measures 30 degrees. What ...
Geometry - 1. How many sides does a regular polygon have if one exterior angle ...
please help!!!!! someone - Each exterior angle of a regular polygon is 15 ...

Search
Members