- #1
dirk_mec1
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Homework Statement
A parallellogram ABCD has an interior point O sucht that [tex]
\alpha + \beta = 180^o
[/tex]
http://img413.imageshack.us/img413/5636/post102741235319763.png
Prove that:
[tex]
\angle{OBC}=\angle{CDO}
[/tex]
Homework Equations
Definitions of a parallellogram.
The Attempt at a Solution
I don't know how to start can some give me a hint?
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