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Section$1\mathrm{.}3$: Problem $7$

$(1$ point$)$

Find the measures of the three angles, in radians, of the triangle with the given vertices: $D(1,1,1),E(1,-3,2),$ and $F(-6,2,5).$

$\frac{?}{{?}_D}=$

$\frac{?}{{?}_E}=$

$\frac{?}{{?}_F}=$

Note: You can earn partial credit on this problem.