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April 18, 2015

April 18, 2015

Posted by **sab** on Monday, March 7, 2011 at 5:37pm.

- geometry -
**Reiny**, Monday, March 7, 2011 at 5:42pmwell, you know that in a ||gram, the adjacent angles must add up to 180°

let one angle be Ø,

the other is 3Ø-12

solve Ø + 3Ø-12 = 180

etc

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