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'?

For a pie chart, the central angle is calculated using the formula (Percentage / 100) * 360 degrees. Since 20 percent of the students obtained first class, we calculate the angle as (20 / 100) * 360 = 72 degrees. The central angle corresponding to first class is 72 degrees.

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