This is a picture of a fan. This picture shows Congruent Acute angles. It may not appear so (due to my shift of hand during the tracing of lines) but they had the exact same angle and size. This object was found off the internet. It is used in houses every day to cool off people. This system also functions off electricity or oil.
Shiv Saini
October 18th, 2012
I found this picture at http://profile.ak.fbcdn.net/hprofile-ak-prn1/41607_104802410390_6563_n.jpg
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