Pie Charts (Leaving Cert Mathematics): Flashcards

$100\%$ of the data

A portion of the total

$360^\circ$

$\frac{360^\circ}{\text{Total number of items}}$

Frequency $\times$ Degrees per person/item

Add up total number of items in data set

Compass

Protractor

$0^\circ$ angle (starting point)

Rotate the paper/chart

All angles add up to $360^\circ$

Most/least popular category and comparisons

Exact numbers of people/items

$\frac{\text{Angle}}{360^\circ} = \frac{\text{Number in segment}}{\text{Total}}$

$\frac{84}{360} \times 240 = 56$