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Saturday 24 March 2012

15. Next Lesson


 

The topic of our next lesson is...


Watch the following video and try to understand it...
We will discuss the lesson in details on 20 April 2012...



 



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Friday 23 March 2012

14. April Test

 


Our monthly test will be held on April...

Please take note on the following details...

Date   : 18 April 2012
Time  : 9.00am - 10.00am
Topic : Perimeter of Circles.





 
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13. Take Home Test



Complete the following test at home. You may refer to any books but DON'T COPY your friend's work.


Please submit before 10 April. 2012.
This test will contribute to 20% of your April test marks.

06_Take Home Test
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Thursday 22 March 2012

12. Skill Practice



Complete this exercise and submit to me before 10 April 2012. Important: This exercise will contribute 10% to your April test marks...

07 Enrichment
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11. Homework 4




Finding the  radius or diameter with the given circumference...
Please pass up Homework 4 before 5 April, 2012.

05_Finding Radius_Diamater With the Given Circumference
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10. Homework 3




Finding Circumference of Circles...
Please pass up Homework 3 before 5 April, 2012

04 Finding Circumference
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09. Homework 2


 
Identifying the length of radius and diameter of a circle.

Please complete this homework and submit to me before 1 April, 2012.


03_Finding the Diameter and Radius
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08. Homework 1






 

Identifying The Parts of Circles...

Please submit the competed homework before 1 April, 2012...

02_Identifying Parts of Circles
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Sunday 18 March 2012

07. Test Bite


By now you should be finishing Task 1 & Task 2 in your school…


Now let’s try to do the following "Test Bite"...
 





Circumference of a circle...


1.
In the calculations below, use \pi = 3.14 .
Work out the circumference of this circle. Give the answer to 1 decimal place.
A circle with a 10 centimetre diameter.
cm
2.
Work out the circumference of this circle. Give the answer to 2 d.p.
A circle with a 2 centimetre radius.
cm
3.
Work out the circumference of this circle. Give the answer to 2 d.p.
A circle with a 4 centimetre radius.
cm 2
4.
Work out the circumference of this circle. Give the answer to 2 d.p.
A circle with an 18 centimetre diameter.
cm 2
5.
Work out the perimeter of this semicircle. Give the answer to 2 d.p.
A semicircle with a 12 centimetre diameter.
cm
6.
Work out the perimeter of this semicircle. Give the answer to 4 d.p.
A semicircle with a 1.4 metre diameter.
m 2
7.
Work out the perimeter of this shape. Give the answer to 2 d.p.
A rectangle, of length 15 metres and width 12 metres, with a semicircle joined on one width edge by its straight edge.
m 2
8.
Work out the perimeter of this shape. Give the answer to 2 d.p.
A rectangle, with a length of 12 centimetres and width of 2 centimetres, with a semicircle joined onto one of the length edges by its straight edge.
cm
9.
Helen's kitchen window is in the shape of a rectangle with a semicircle at the top. What is the total perimeter of the window? Give the answer to 4 d.p.
A rectangle with a semi-circle joined on to one of the width edges of the rectangle, by it's straight edge. The rectangle's length is 1.8 metres, and its width is 1.2 metres.
m 2
10.
A running track is marked as shown. The straight part of the track is 100m long and the width across the track is 62m. The ends of the track are semicircular.

A running track shape, composed of two semicircles joined onto the width edges of a rectangle. The rectangle is 100 metres in length and 62 metres in width.

Calculate the perimeter of the inside of the track. Give the answer to 2 d.p.

m


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Saturday 17 March 2012

06. The Circumference of a Circle



 





The circumference is the distance around a circle....


We can calculate the circumference of a circle if we know the value of either the diameter or the radius of the circle.



These formulas are very useful...
Try to memorize the formulas...






Try to understand how to find the circumference of a circle with the given radius or diameter...





Still want more...???





  

 






1.  Sally purchased a mini CD that was 5 inches in diameter.  What is the circumference of the CD?
A.
B.
C.
D.



2. At the railroad crossing, Mike noticed the crossing sign.  He and his friends discovered that the circumference was 69.08 inches.  What was the diameter of the sign?
A.
B.
C.
D.


3. The basketball team plays with a ball with a radius of  6 inches.  What is the circumference of each basketball?
A.
B.
C.
D.


4.  Nathan and three of his friends were building a duck blind to go hunting.  They knew for all of them to fit inside that they needed a circumference of 15.7 yards.  What diameter must the blind have for it to have the correct circumference?
A.
B.
C.
D.
5.  If the diameter of a circle is 15 cm, what is the circumference of the circle?
A.
B.
C.
D.

6.  When measuring the hula hoop in class, group C discovered that it had a radius of 7 inches.  What is the circumference of the hula hoop?
A.
B.
C.
D.

7.  The laundry basket that Mrs. Smith uses for recycling has a diameter of 25 cm.  She wants to move the basket to another place in her classroom.  In order for her to complete this task, she must know the circumference of the basket.  Please find teh circumference of the basket so Mrs. Smith can determine where to place it.
A.
B.
C.
D.

8. When determine the circumference of a circle, you must find the ____________ and multiply it by 3.14.
A.
B.
C.
D.

9.  The radius of a circle tells
A.
B.
C.
D.




10.  The table we have to sit at has a circumference of 6.28 yards.  We need to find the diameter of the table.
A.
B.
C.
D.


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