Question

12 out of 30 people chose their favourite colour as blue calculate the angle you would use for blue on a pie chart

Answer 1

First, I'll calculate the percentage:

$\frac{12}{30} *100%= \frac{12*100}{30} = \frac{120}{3} =40$

so it was 40 % of people that chose blue

And now we can calculate the angle;
 

the full chart would have 360 Degrees, and the "blue" portion of the chart would have 40 % od 360 or $\frac{40*360}{100} =4*36=120+24=144$


so the angle would be 144 degrees!