Eliot was trying to factor 6x^2-18. He found that the greatest common factor of these terms was 6 and made an area model
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bearing in mind that, on the III Quadrant, sine as well as cosine are both negative, and that hypotenuse is never negative, so, if the sine is -4/5, the negative number must be the numerator, so sin(x) = (-4)/5.