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I need some help with this. It has to do with the exterior angle therom but i just dont understand it.

I need some help with this. It has to do with the exterior angle therom but i just-example-1

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The exterior angle theorem is that exterior angle of x + 80 = x^2 + 3x.

I need some help with this. It has to do with the exterior angle therom but i just-example-1
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