Thurs - TEST TOMORROW, project deadline extended

Test tomorrow - Study the pretest and the six problems on the half-sheets.

You should be working on your Math project!
Deadline is extended to Friday Nov 12th.
If you hand it in by Friday Nov 5th you'll get 5% bonus.

Remember - Extra-help everyday after school - Chocolate will be provided.

Monday Oct 25th - FREE PERIOD TOMORROW!!

HW - Do all odd questions on the Circle Pre-Test, due Wednesday.

Circles Test will be Friday.

Math Project due a week from Wednesday (Nov 3rd)

Math Project - due Wednesday Nov 3rd

Math Project – Exploring the Circumference and the area of a circle
(Remember Area is all about the radius!!... Circumference is all about the Diameter!)

Part 1 – Circle Vocabulary
1. Draw a circle. Label the radius, diameter, circumference, centre, a chord and an arc.


Part 2 – Finding the circumference (think diameter!)
2. What is the formula to calculate the Circumference of a circle?
3. Describe in words how this formula works.
4. Explain (in words) how we compared the diameter and circumference using yarn.
5. Display your Excel Circumference database.
6. Discuss how your results compare to other groups in the class.


Part 3 – Finding the Area (think radius!)
7. What is the formula to calculate the area of a circle?
8. Describe in words how the formula works.
9. Choose three methods to calculate the area of a circle. Describe and demonstrate each method.
10. Which method was most accurate? Explain.

Part 4 – Pi
11. What is pi? Explain in your own words. List your sources of information.

BONUS
12. Demonstrate more than three ways to find the area.
13. Include more information about pi (history, other uses for it…)
14. Produce creative art inspired by circles or pi (Anything goes – painting, anime, video, song, spoken word. Have fun! )


Presentation: You can choose the format: duotang, poster, video or other.

Due date: Wednesday November 3rd , 2010. Some work will be done in class, but you will need to work at home too.

See me outside of class time if you would like to work with a partner.

Brainstorming about Area - Tuesday Oct 19, 2010

Today we brainstormed ways to calculate the area of a circle. Ms. Gesner was very impressed by the depth of the thinking.

Ways to calculate area of a circle

1. Use the formula. A = ∏ r^2 (Area equals pi times the radius squared. Area equals pi times radius, times radius)

2. Use gridpaper.

3. Use the "Egyptian method"

Here is one way to do it (There are several similar methods).

Draw a square around the circle with sides equal to the diameter

Divide the circle into 9 equal squares

Connect the dots to draw an octagon

Calculate the area of the octagon.

4. Use the Lucas pizza pie triangle method.

Divide the circle into 8 slices.

Use the formula for area of a triangle (A = b x h /2) to caculate the area of each slice

5. Use the "lazy parallelogram" method.

Cut the circle into 8 slices. Make a parallelogram. The area of a parallelogram = b x h (not side times side... you must use the height of the parallelogram)

Homework:Finish all examples on sheet "4.3 Circumference of a Circle"

vendredi le 15 octobre

Today we discussed - If we know the Circumference how can we go backwards to find the diameter?

USING DIVISION!

C=pi x d so d = C/pi

(in words, Circumference equals pi times the Diameter. The Diameter is Circumference divided by pi.)

Next we finished comparing diameter and circumference using yarn.

Homework: - Do all even questions on sheet "3.4 Circumference". Do the maze and pizza examples on the back. This is due Tuesday because Monday is Day 8, no Math Class :-(

Have a nice weekend!.

Thurs - Mini-Quiz & more circles

As a warm-up we looked at XZY + XYZ = YZX. X must be less than 5, Y must be at least double X. X=4 Y=9 Z=5
We did a short quiz on circles.
We corrected the odd numbers of the circle questions.

HW - Finish all questions on the circles page.

Tuesday & Wednesday

Tuesday - We used yarn to explore the ratio between diameter and circumference of a circle.

Wednesday - In the lab we finished the Geometer's Sketchpad lab. In class we did "Circumference of a Circle" worksheet.

HW - Do all odd examples on both sides of the circle sheet. QUIZ TOMORROW - Know how to label the radius, diameter & circumference.

Friday - Geometer's Skektchpad!

Today we reviewed the terms diameter, radius and chord.

We then came down to the lab to use the fabulous programme GEOMETER'S SKETCHPAD.

Homework:

Bring a Geometry set, amke sure test was signed and have a happy Thanksgiving.

Wednesday, Thursday - Square Roots and Circles

On Wednesday we looked at how to approximate the value of a square root.

Homework: Do #18-22 on Square Roots sheet.

On Thursday we discussed circles - What makes them unique? - What makes them hard to draw freehand?

We watched a video on freehand circles:

http://www.youtube.com/watch?v=eAhfZUZiwSE

Radius -

Diameter -

Circumference -

Monday Oct 4th - a quiet class

Today some students were finishing Test #1.
The other students worked quietly on the puzzle sheet, or on doing all examples on sheets where only odd or even numbers were assigned.

Homework for Tuesday:
"Chapter 3 Pretest Sheet" Do all examples in Column a (Do 1a, 2a, 3a, 4a, 5a, 6a)

How to multiply decimals:
http://www.youtube.com/watch?v=zEHbLRHxQpE