Friday, March 21, 2014

If the measure of one exterior angle of a regular polygon is 36 degrees, how many sides does the polygon have?

The sum of exterior angles of ANY regular polygon is 360
degrees


This can be proved because one exterior angle and
one interior angle add up to be 180 degrees


the total
interior angle sum is 180(n-2)


the total exterior +interior
sum is
180n


180n-180(n-2)=360


In this
question, each exterior angle is 36 degrees


the total is
360 degrees


Therefore, the number of sides is 360/36= 10
sides


It is a dodecagon


The
Final answer:


The polygon has 10
sides.


this method works for any regular
polygon

No comments:

Post a Comment

What is the meaning of the 4th stanza of Eliot's Preludes, especially the lines "I am moved by fancies...Infinitely suffering thing".

A century old this year, T.S. Eliot's Preludes raises the curtain on his great modernist masterpieces, The Love...