## Wednesday, June 16, 2010

### exam review circles

Exam review : Circles

300 ugly kids were asked what is their favorite color. how many like blue? how many like green? how many like gold?

Blue: 75 kids
Green:90 kids
Gold:135 kids

What is the estimated ratio of circumference to diameter? 3.14:1
Find the circumference when the radius is 6cm/
R=D simplified formula > C=2 3.14 r
2(6)=d
12=d
C=3.14D
C=3.14(12)
C=37.68cm

Find area when diameter is 10m
R=d/2
R=10/2
R=5
A=3.14 r squared
A=3.14 5 squared
A=78.54 squared

The measure of a sector is 20% of the data. what is the central angle for this sector?
20% of 360
0.2 x 360=72 degrees

I have a pool with a radius of 6m. my yard is 30m by 15m. how much space do i have left in my yard
A yard=l x w r=pi r squared how much left= 450m squared - 113.10=336.9
= 15 x 30 r=113.10
= 450m squared

## Tuesday, June 15, 2010

### Probability exam review

Probability: Is the likelihood of an event occurring.

Probability = favorable outcomes
Possible outcomes probability can be express as a ratio, fraction, or a percent.

Outcome = A possible result of a probability experiment.

Favorable outcome = What we want to happen.

### Exam Review Study Guide and Homework Package.

Perpendicular- Describes lines that intersect at right angles

Parallel
- Describes lines in the same plane that never cross or intersect

Intersecting
- Lines that cross at any angle

Perpendicular Bisector
- A line that divides a line segment in half and is at right angles to it

Angle Bisector
- The line that divides an angle into 2 equal parts

Acute Angle
- An angle that is less than 90* *-degrees

Obtuse Angle
- An angle greater than 90*

Right Angle
- An angle that is at 90*

Formula Area of Triangle
- B x H / 2

Formula Area of Parallelogram
- B x H

1. pg. 449. - 451 #3-16
2. pg. 444. - 445 #1-8
3. pg. 426. - 427 #1-17
4. pg. 405. - 407 #1.21
5. pg. 327. - 329 #1-21
6. pg. 329. - 322 #1-23
7. pg. 313. - 315 #1-20
8. pg. 270. - 272 #1-15
9. pg. 249. - 251 #1-5
10. pg. 220. - 221 #1-14

REMEMBER TO STUDY FOR EXAMS!

### Exam Reveiw

Define the following:

Variable: A letter that represents an unknown number.

Example: A,B,C

Equation: A mathematical statement with two expression that have the same value
.
Example: 1+1=2

Expression: Any single number or variable or a combination of operations involving numbers and variable.

Example: 2x2x2

Find and Describe the pathern,Identify the 3 terms.

64,58,52,46,.......40,34,28

As you see the pathern is that the number decreases by 6.

Define the following:

Mean: The mean is the average of the whole the data.

Example: The average of the this data is 78.6

67,75,78,84,89

Median: The median is the middle number of the data after it is arranged.

Example:10,4,9,5,2,8,1,3,6,7 after it was been arranged 1,2,3,4,5,6,7,8,9,1o the middle number is 5. 1,2,3,4,5,6,7,8,9,10.

Mode: The mode is the number that showed up the most in the data.

Example:12,33,25,44,33,19,65,78,33. The mode in this data is 33 because it shows up the most.

Outlier: An outlier is a number that is too small or big compared to data.

Example: 10,12,16,17,19,24,1999. The outlier is 1999 because it is way too big compared to rest of the data.

Range: The range is the difference of the biggest number and the lowest number in the data.(Positive)

Example: 23,67,89,25,100,13,7. The range of this data is 93. 100-7=93.

Here is website.
http://staff.argyll.epsb.ca/jreed/math7/strand4/4104.htm

### Exam Review Study Guide

Perpendicular- Describes lines that intersect at right angles
Parallel- Describes lines in the same plane that never cross or intersect
Intersecting- Lines that cross at any angle
Perpendicular Bisector- A line that divides a line segment in half and is at right angles to it
Angle Bisector - The line that divides an angle into 2 equal parts
Acute Angle- An angle that is less than 90* *-degrees
Obtuse Angle- An angle greater than 90*
Right Angle- An angle that is at 90*
Formula Area of Triangle- B x H / 2
Formula Area of Parallelogram- B x H

50x20= Find the Area --------------Answer-------------- 1000M2

LABEL

Label These pictures

Click this link to look at a site all about angles!!

## Sunday, June 13, 2010

### Exam Review from June 8, 2010

A kid in the forest is trying to get home. He gets to a fork in the road. There is a sign showing 4 different paths and 5 different distances. How many possibilities can choose from. Show with a table.

True or False?

Find the common factors of 10 and 15 using a venn diagram.

Find the factors of 24.

23/4 change it to a mixed #.

2 4/7 change it to an improper fraction.