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In a test in Mathematics, $20 \%$ of the students obtained "first class". If the data are represented by a Pie-Chart, what is the central angle corresponding to "first class"
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Central angle $=20 \%$ of $360^{\circ}$
$=\frac{20 \times 60}{100}$
$=72^{\circ}$
$=\frac{20 \times 60}{100}$
$=72^{\circ}$
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