Enriched Pre­Algebra ­ Circle Graphs (Chapter 9­2)
Circle Graphs
(Enriched Pre-Algebra) (Chapter 9-2)
Draw a circle graph for
each set of data.
Circle Graph: A type of statistical
graph used to compare parts of a whole.
1.)
Writing Degrees:
There are 360 degrees in a circle.
Think of the circle as a clock.
There are 12 hours in a complete
circle.
Every 3 hours = 90 degrees.
(12-3, 6-9, even 4-7)
Every hour = 30 degrees.
Every minute = 6 degrees.
(remember à 60 minutes
in a complete circle)
2.)
Steps:
Make a ratio for each activity/item.
(part compared to the whole)
Change each ratio into a decimal.
Change each decimal to a percent.
Change to degrees: Multiply each
decimal by 360º. (round to the
nearest one)
Create your graph accordingly.
Make sure to use a ruler and a compass.
You should total your percents
& they should equal 100
(or very close to it).
You should also total your
degrees & they should equal
360º (or very close to it).
1
Enriched Pre­Algebra ­ Circle Graphs (Chapter 9­2)
Circle Graphs
(Enriched Pre-Algebra) (Chapter 9-2)
Draw a circle graph for
each set of data.
Circle Graph: A type of statistical
graph used to compare parts of a whole.
1.)
Writing Degrees:
There are 360 degrees in a circle.
Think of the circle as a clock.
There are 12 hours in a complete
circle.
Every 3 hours = 90 degrees.
(12-3, 6-9, even 4-7)
Every hour = 30 degrees.
Every minute = 6 degrees.
(remember à 60 minutes
in a complete circle)
2.)
Steps:
Make a ratio for each activity/item.
(part compared to the whole)
Change each ratio into a decimal.
Change each decimal to a percent.
Change to degrees: Multiply each
decimal by 360º. (round to the
nearest one)
Create your graph accordingly.
Make sure to use a ruler and a compass.
You should total your percents
& they should equal 100
(or very close to it).
You should also total your
degrees & they should equal
360º (or very close to it).
2
Enriched Pre­Algebra ­ Circle Graphs (Chapter 9­2)
3
Enriched Pre­Algebra ­ Circle Graphs (Chapter 9­2)
Circle Graphs
(Enriched Pre-Algebra) (Chapter 9-2)
Draw a circle graph for
each set of data.
Circle Graph: A type of statistical
graph used to compare parts of a whole.
1.)
Writing Degrees:
There are 360 degrees in a circle.
Think of the circle as a clock.
There are 12 hours in a complete
circle.
Every 3 hours = 90 degrees.
(12-3, 6-9, even 4-7)
Every hour = 30 degrees.
Every minute = 6 degrees.
(remember à 60 minutes
in a complete circle)
2.)
Steps:
Make a ratio for each activity/item.
(part compared to the whole)
Change each ratio into a decimal.
Change each decimal to a percent.
Change to degrees: Multiply each
decimal by 360º. (round to the
nearest one)
Create your graph accordingly.
Make sure to use a ruler and a compass.
You should total your percents
& they should equal 100
(or very close to it).
You should also total your
degrees & they should equal
360º (or very close to it).
4