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April 20, 2015

April 20, 2015

Posted by **Sarah** on Wednesday, February 23, 2011 at 4:06pm.

- geometry -
**Reiny**, Wednesday, February 23, 2011 at 5:31pm"adjacent" angles of a parallelogram add up to 180°.

so let one angle be x

then the adjacent is 3x-12

solve for x

x + 3x-12 = 180

So now you have a pair of adjacent angles, take it from there.

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