Pie Charts

Introduction to Pie
Charts

A fundamental tool for visualizing proportions

by Rachel McNameeRA

Open Ended

What are the advantages of using pie charts?

Advantages of Using Pie Charts

1

Simple Data
Representation

Easy to understand

proportions and

percentages

2

Effective for
Comparing
Categories

Clear visualization of

how parts relate to the

whole

3

Visually Striking

Eye-catching and

memorable for

presenting key data

Drawing a Pie Chart

​Step 1
Calculate the total

​Step 2
Calculate the angle for each segment using the formula

Step 3
Angle = (Data Value /
Sum of Values) x 360

How to Calculate the Angles of a
Pie Chart

1

Example Calculation

Angle = (Data Value / Sum of Values)

x 360°

2

Example Calculation

5 ÷ 15 x 360 =119.9°

Rounded to 120°

Multiple Choice

How many birds are represented by the green sector?

• 5

• 20

• 9

• 13

Multiple Choice

What angle would you use to represent 40 red cars out of 90 cars in total on a pie chart?

• 40 degrees

• 160 degrees

• 4 degrees

• 90 degrees

Multiple Choice

The pie chart shows the colours of 32 beads. How many green beads are there?

• 90

• 8

• 11

• 9

Multiple Choice

A PIE Chart is created using

• Cherries
• Apples
• Data
• Cars

Multiple Choice

This pie chart shows the colour of hats that Tom owns. Which colour hat does he own the second most of?

• red

• blue

• green

• yellow

Multiple Choice

Which Continent has the smallest % of wild cats?

• Asia
• Europe
• North America
• South America