Notes For December 20 ,2010

$1.75 per lap or 20 laps for $30.00. How much per lap if you buy the $30.00 package?

30/20= $1.50


1 person buys 5 laps. 3 people buy 20 laps packages. Estimate then calculate the total cost.

$1.75= $2.00 $1.75*5= $8.75
5*2=10 3*$30.00= $90.00
3*30=90 $8.75+$90.00= $98.75
=$100.00


G.S.T =5% P.S.T= 7%

Calculate the tax on a t-shirt with a price tag of $15.00

12*15=1.8
5% +7% = 12%
The tax of the t-shirt is $1.8

40 shots 26 hits right in the bulls eye. Show the fractions, decimal, and percent.

26/40=0.65=65%

Notes For December20 ,2010

Here is Mr. Isfeld's notes
Express as fractions
0.7 = 7\10 - there is 1 place to the number ( 7 ) so there is one zero
0.67 = 67/100 - there is 2 places to the number ( 7 ) so there is 2 zeros

0 . 6555555 ... three dots mean the zeros go on forever !
Could it be written has 0.65 ( with the line on 6 and 5 ? )
os it true or false ? False because it's on both 6 and 5 it just needs to be on the 5 !
a / b , the top number means numerator and the bottom one means denominator
Numerator has to be a whole number so does the denominator
here is a video :
http://www.youtube.com/watch?v=rPaRKHDxFi4 Go here !
here is a http://themathgames.com/ website you can go to !


Remember that page 44-45 in your math homework book !

Fractions, Decimals and Percentage

Fraction- out of any whole number

Example: 1/2, 1/3, 2/7, 123/200

Decimal- out of 1

Example: o.5/1, 0.1/1, 0.001/1

Percent- always out of 100

Example: 50%, 75%

Here are some links to help you!

Fractions and Percentage link

Decimals link

Sorry I couldn't find a video!

Chapter 3 review # 8-10

8.) Copy these line segments. Draw the perpendicular bisectors using two different methods . Measure the two parts of each bisected line segment. Record each set of measurements.






a.) I used a compass to find out the perpendicular bisector.


b.) I used a right triangle and a ruler.

9.) A support must be placed under the pool table at it's centre. Make a sketch of the pool table. Draw the position of the perpendicular support. Label the support and label the measures of the table lenghts on each side of the support.

*The lenght of the pool table is 3.5 cm and the width of the pool table is 8.5 cm.


10.) You draw a 30 cm line segment. You then draw a perpendicular bisector of one of the bisected line segments.




(*not exactly 30 cm. 30 cm is too long, that line segment is 14 cm)

a.) What is the lenght of the shortest line segment?

-The lenght of the shortest line segment is 3.5

b.)How does the length of the shortest line segment compare to the lenght of the original line segment?

-The shortest line segment is 'shorter' compared to the original line segment.

Here is a video about constructing a perpendicular bisector.

Chapter 3 Review # 11,12,13

Chapter 3 Review

11.)
A.) The angle is 36 Degrees,cut the angle in half,18 Degrees for a result

B.) The angle is 120 degrees

12.)

A.) 66 degrees

B.) you contruct an angle bisector of an 80 degree angle

13.)

A.) 20 degrees

B.) 1/4 of an original angle

Questions 16 and 17.

Question 16:

What is the area of each triangle?

A)

The formula is Base x Height, divided by 2.

2 m x 6 m = 12 m

12 m ÷ 2 = 6 m

So the answer is 6 m ².

B)

b = 5.2 m, h = 5.3 m

5.2 x 5.3 = 27.5

27.56 ÷ 2 = 13.78 m

The answer: 13.78 m ²

Question 17:

Aleta has a pasture for her horses. The pasture runs alongside a creek as shown. What is the approximate area of the pasture? Explain how you determined show your answer.

1.1 km will be your base.
1.6 km will be your height.

1.1 x 1.6 = 1.76

1.76 ÷ 2 = 0.88

The answer: 0.88 km ². It is an app. answer because the creek is NOT straight.


Here is a video to help you find the area of a triangle.



Also, here is a link for you to play.

Here is Mr.Isfeld's Notes

Every triangle is half of a Parallelogram . We know the formula for the area of a triangle is half the area of a Parallelogram

Formula for area of a triangle is BASE TIMES HEIGHT DIVIDED BY 2

Hope this helps you ... sorry i didn't put a picture it didnt work and remeber to study for the test on Thursday , do pages 36 - 37 in your homework book

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by liam

# 7-9 answer

7) a) 11x5=55 cm2

b) 9x7=63 cm2

c) 62.x3=18.6 cm2

8) a) 9x3=27 m2

9) A= bxh

3x4=12 m2

Questions and Answers for # 10,11,12 and 13

10.Question: A parallelogram-shaped stripe is going to be painted on the wall of a daycare center. There is enough paint to make a stripe with an area of 9 m2. How high can the stripe be?
Answer: The height of the stripe can be 6 m. I got it by dividing 9 m to 1.5 m which the answer is 6 m.

11.A.)Question: With a ruler, measure the base and height of this parallelogram. Explain how you measured.
Answer: b= 1.5 cm , h= 2 cm. I measured the base by measuring the bottom part of the parallelogram which I got 1.5 cm. I measured the height by measuring the top to the bottom of the parallelogram which I got 2 cm.
B.)Question: What is the area?
Answer: The area of the parallelogram is 3 cm. How I got it is by multiplying b= 1.5 cm to h= 2 cm.
C.)Question: Use a different side of the parallelogram as the base. Determine the new height and calculate the area. How does this compare to your answer in b)?
Answer: I used the base as the height for B.) which I got 2 cm. I used the height as the base for B.) which I got 1.5 cm. Basically, I just change the position of the numbers which means that the parallelogram have 4 equal sides.

12.Question: Which of the two shapes shown below has a greater area? Explain your answer.
Answer: Shape A because the line is straighter or its more perpendicular to the base.

13.Question: The spring thaw has caused a rectangular section of the schoolyard to flood. A
parallelogram-shaped wooden walkway is being placed over it as shown. The area of the walkway is 22 m2. How wide will the base of the walkway be in meters?
Answer: 2 m. How did I got it? is by dividing 22 m to 11 m which is equal to 2 m.

Image:



http://www.mathgoodies.com/lessons/vol1/area_parallelogram.html I hope this link would help you practice more!

*SORRY I DON'T HAVE ANY VIDEO* :(

textbook questions4-6

4. Determine the area of each parallelogram. I drew the same shape again beside it so you can see it better.

Answer:a) A=bxh

A=4x1

A=4cm2

b) A=bxh

A=3x3

A=9cm2

These are the answers because for a) 4 cm is the base because the height which is 1 cm is perpendicular to the base. Then all you have to do it multiply 4 x 1= 4 then put centimeter squared which is just a little 2 after the cm. Then do the same thing for b.

5. Draw each of the following parallelograms on a centimeter grid paper. Use the formula to determine the area of each parallelogram.

Answer: This is the answer for a) because the height is 5 cm high and the base is 4 cm wide of the parallelogram.the dotted line is the 5 cm for height because the rule is that the height has to equal 90 degrees when it reaches the base. Just like how a parallelogram is counted as a rectangle also. Then I just multiplied 4 cm x 5 cm.

6. Draw each parallelogram on centimeter grid paper.Determine each area using the formula.

Answer:a) A=bxh

A=4x6

A=24cm2 I don;t think I need to explain again because by now you should know because this was the same thing we just did earlier.

b) A=bxh

A=4x7

A=28cm2

Here is a link you can use to help you understand more.

I hope this helped you (:

# 1-3 Answers

1. A parallelogram and a rectangle are the same length at the sides.
2. She did not include the "0.5cm".
3. a) 3 cm2 b) 6 cm2

Hope this helps you!