## Wednesday, June 16, 2010

### 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.

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

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.**

**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

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 These pictures

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

## Sunday, June 13, 2010

### Exam Review from June 8, 2010

Find the factors of 24.