Pie Charts (Junior Cert Mathematics): Quizzes

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Pie Charts
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What is a pie chart?

A circular chart divided into slices

How many degrees are in a full pie chart circle?

360∘360^\circ

Which tool is used to draw a perfect circle for a pie chart?

Compass

Which tool is used to measure the angles when dividing a pie chart into slices?

Protractor

What is the formula to calculate the angle for each slice?

(CategoryTotal)×360∘(\frac{\text{Category}}{\text{Total}})\times360^\circ

In the worked example, what angle represents Oil heating with 30 out of 72 households?

150∘150^\circ

In the worked example, what angle represents Gas heating with 24 out of 72 households?

120∘120^\circ

What does the whole circle (pie) in a pie chart represent?

The entire data set

When reading a pie chart, what do larger slices indicate?

Larger values

Why is a pie chart useful?

Shows parts of a whole clearly

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