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Let interior angle be x
exterior = $\frac{2}{7}$x
x + $\frac{2}{7}x$ = 180;
$\frac{9x}{7}$ = 180
$\frac{180 \times 7}{3}$ = x;
x = 140
the number of sides is $\frac{360}{40}$ = 9
johnmulu answered the question on June 12, 2017 at 06:52
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