Thursday's Test !

Chapters: 5, 6, 7 and 8.

5 probability - outcomes. 

6 fractions - divisibility subtracting. 

& fractions - add + subtracting.

                    - like + unlike denominators.

                    -mixed numbers. 

8 circles - construct. 

                - circumference, radius, diameter, area.

                - formulas. (know them)

                - pi, 3.14, symbol. 

                - circle graphs. 

A lot to study guys, so spend time studying every night if you want to pass! :) 

Review from your notes, the blog, or the online textbook. 

Also; 

ASK ISFELD FOR HELP! He wouldn't want to see you fail. :(

This test goes in your portfolio for student led. So do well, and impress your parents! :) 

HOMEWORK: 

Pages 298 - 299. #s 1-22.

Construct a Circle Graph

Create Circle Graphs .

1. Construct(make, build) a circle
Use a string, compass or trace a circle.
2. Create the Central Angles
- central angle is an angle formed by 2 radii
- the vertex of the angle is at the center of the circle
Create a circle graph :
25% like strawberry
25% like vanilla
50% like chocolate




Make a graph for the following information :
3 kids use the computer 1-3 days per week.
9 kids use the computer 0 days per week.
18 kids use the computer 4 or more days per week.
Step 1. Find out how many in total.
Add all of the kids together = 30 kids in total
Step 2. Convert to percent
100% = 360 degrees .
10% = 36 degrees
30% = 108 degrees
60% = 216 degrees
Try this website :
http://www.mathplayground.com/piechart.html
Homework
Pages 296-297
Questions 4-13

Circle Graph

A circle graph is a graph that is represents data using sections of a circle.
Sector- A sector of a circle formed by 2 radii and the arc of the circle connection the 2 radii.




Example of a General Graph and a more Specific Graph



How many were asked ?


1) Title = Pets of students in Mr.W's class (24 students)
2) What are the different categories represented by the graph ?
- Cat, Dog, Other, No pets .
3) What percent of the class has a dog ? How many have a dog ?
- 25 % of the class has a dog .
- 6 kids have a dog
4) What percent of the class has a cat ? How many have a cat ?
- 33 % of the class has a cat .
- 1/3 of 24 = 8 Kids have a cat .
5) What percent of the circle is represented by all the sectors ?
- 100 %
6) Would this graph make sense if the title or sector labels were missing ?
- No, because then we wouldn't understand what the graph is all about .

Create your own Circle Graph on : http://www.mathplayground.com/piechart.html
Watch a video about circle graphs : http://www.youtube.com/watch?v=jFg-e51Rhv4

www.mathplayground.com

Circle

Parts of the Circle

• centre
• radius
• diameter
• circumference - is the distance around a circle
  

-usually represented by c

-this is a linear measurement

π = pi- the ratio of the circumference of a circle to its diameter

1. Find circumference if diameter is 2m.

2. Find circumference of each circle.

Circles

Radius - a distance from the centre of the circle to the outside edge.

- represented by r

Diameter - distance across a circle through its centre

- represented by d

A diameter is 2 radii.

Construct a circle with a radius of 4cm.

1. Start with centre of a circle.

2. Measure the length of a radius on a string.

3. Pencil at one end of string and pin the string in the centre of the circle.

4. Trace an arc around the centre.

Using a compass:

1. Measure a line the length of a radius.

2. Sharp point of compass in the centre of the circle.

3. Pencil at the other end of the line.

4. Draw an arc around the centre.

Homework:

pages 270-272

# 1-15

Do literacy link also.

Video/s and Link/s

Radius and Diameter

Definition of a Circle

Radius and Diameter (Video)

Today at school :)

Homework : 260- 261 (Chapter Review)
And 262- 263 ( Practice Test )
Remember : NO SCHOOL ON MONDAY :)