Question 22

## Sunday, December 18, 2011

### Shane's Blog Post

Question 22

## Wednesday, December 14, 2011

### Cathlene's Blog Post

**4.3 Similar Triangles**

*ALWAYS*be equal

*always*upper case

*always*lower case

*Homework*

## Tuesday, December 13, 2011

### 4.2 Scale

Scale can be expressed as a ratio, as a fraction, as a percent, in words or as a diagram.A scale of 1:50 means that 1 unit on the diagram is equal to 50 units of the actual object.

Scale Diagram: is similar o

r t

he actual or object. It main

There

are two ways to find a missing length of proportiontain proportion, the diagram may be longer or smaller than the actual object.

Example One: Use scale to determine the Actual Length of an Object.

For a scale of 1:14 and a

diagram measuring 5.5c

m set the proportion.

SCALE: is a comparison

of two objects; the actual size and its diagram.

Scale can be expressed as a ratio, as a fraction, as a percent, in words or as a diagram.

A scale of 1:50 means that 1 unit on the diagram is equal to 50 units of the actual object.

**SCALE DIAGRAM :**Is similar or the actual or

object. It maintain proportion, the diagram may

be longer or smaller than the actual object.

There are two ways to find a missing length of proportion

Becau

se it is easy to find the relationship of 1 to 5.5 it easy to find x, simply multiply 14 by 5.5 to find x=77cm- So the actual object is 77cm.

Example Two: Use Measurement to find Scale.

## Monday, December 12, 2011

### Jocelyn's blog post on todays lesson

**Enlargement**is to make something bigger. In mathematics we need to multiply by a factor greater than 1 to make it an enlargement. (eg. 3x2)

**Reduction**is to make something smaller. In mathematics we need to multiply by a factor that

**Scale Factor-**the constant factor by which all dimensions of an object are to be inlarged or reduced. some examples of this is:

**3.9x6.5**. If that same rectangle was to be Reduced by a scale factor of 0.6 the new dimensions would be

**1.8x3**

**Homework:**

## Saturday, December 3, 2011

### Lizelles text book question.

My text book question is 27 on 2.4

"The surface area of a cube is 100 cm squared. Determine the edge length of the cube, to the nearest tenth of a centimetre."

A CUBE has 6 faces.

Since I knew that, I divided 100 cm squared by 6 to give me one face.

That got me 16.66 cm squared.

Since I wanted to get rid of the squared, I did a square root of a 16.66.

For that, I got 4.082.

I rounded that to the nearest tenth, and I got 4.1.

I checked at the book, and I got the same answer.

My question:

My work:

## Thursday, December 1, 2011

### Jocelyn's textbook question 2.4

**Question #19 in 2.4**

**A square picture with an area of 100cm^2 is mounted on matting 2.5 times the area of the picture. If the picture is centered on the matting, what is the width of the matting that is showing? Give your answer to the nearest tenth of a cm.**

### Colleen's Blog Post

*You need to know the formula's for 3.4

Bacteria triples every 15 minutes.

Start with 50 bacteria.

The coefficient is 50.

50(3^1)

In one hour: 50(3^4)

In three hours: 50(3^12)

t hours: 50(3^4t)

Question from yesterday:

Homework:

3.4- Show You Know

Check Your Understanding

Practice odd or even

Apply

Extend #13

Homework book

Extra Practice

Don't forget to do 3.3 if you're not done.

Don't forget to start your stash it.

Go on MANGAHIGH!

Jocelyn, it's your turn to do the blog.