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January 25, 2015

January 25, 2015

Posted by **Anonymous** on Thursday, February 2, 2012 at 8:10pm.

draw a model

paper/pencil

calculator

- Triangles -
**Reiny**, Thursday, February 2, 2012 at 8:41pmI would use algebra

the actual calculations can then be done mentally.

let angle 2 = x

let angle 1 = 2x

let angle 3 = 2x-40

2x-40 + 2x + x = 180

etc.

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