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January 24, 2015

January 24, 2015

Posted by **Gail** on Sunday, December 18, 2011 at 12:49pm.

- Algebra2 -
**bobpursley**, Sunday, December 18, 2011 at 1:18pmThe sum of the three angles is 180deg

b=21+a

c=54+a

add a+b+c and set = to 180

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