Question

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"?

• A. ${20}^o$
• B. ${36}^o$
• C. ${72}^o$
• D. ${144}^o$

Answer 1

Answer: (C)

${72}^o$

The Pie Chart is a part of Circle,

Total Central Angle is ${360}^o$

So, ${360}^o=100\%$

$\Rightarrow \frac{{360}^o}{100}=1\%$

So, $20\%$ $=\frac{{360}^o}{100}\times 20={72}^o$