Chelsea's Textbook Question - 2.4

Here is the question from 2.4. I will be doing part A of it:

So it will cost $3504 to enclose a square with an area of 120m^2.

Chelsea's Textbook Question

Here is the question that we're going to solve from 2.1, Comparing and Ordering Rational Numbers:

26. Which number in each pair is greater? Explain each answer.

a) 0.4 and 0.44

b) 0. 333... and 0.33

c) -0.7 and -0.77

d) -0.66 and 0.66...

So, in order to figure out which number is greater, we have to put the decimal numbers onto a number line first. Then, you can convert it into a fraction (which you should still remember how to do so):

a)

0.4 = 4/10

0.44 = 44/100

0.44 is greater than 0.4

b)

0.333... = 1/3

0.33 = 33/100

0.333... is greater than 0.33

c)

-0.7 = -7/10

-0.77 = -77/100

-0.7 is the greater number than -0.77.

d)

-0.66 = -66/100

0.66... = 2/3

-0.66 is greater than 0.66...

If I have forgotten anything, please tell me!

Chelsea's Blog Post - Surface Area

Today in class, we solved 2 questions from the textbook (pg. 34- 35), in which both had to deal with finding out the surface area for them.

For the first question, we had to find the outside surface area of the chimney, which looked like this:

In order to find the surface area, first, we had to take the cylinders apart, as shown:

So, next, we had to find the radius:

Small rectangle:

r = d/2

r = 30/2

r = 15

Large rectangle:

r = d/2

r = 50/2

r = 25

After that, then we could complete the formula (remember, it said to give your answer to the nearest hundredth of a square metre):

The answer would now be 1.92m^2.

The second question we had to figure out, was finding the total area of the surfaces needed to be painted inside of a swimming pool, which looked like this:

Then, we had to take the shapes apart so that we could easily find the surface area:

Now, time to solve for the surface area (once again, to the nearest square metre):

Homework:

- Questions #13, 15, and 16 in the textbook (pg. 34-35)

- Vocabulary Link

- Chapter One Reviews (both from the textbook and the homework book)

Try to do as many questions as you can! It's great practice for your Surface Area test on Wednesday! If you don't know what the test will be on, make sure you study:

• square and rectangular based prisms
• triangular based prism
• cylinder
• composite shapes (made up of 2 or more shapes)

If you don't understand any of the questions that you have attempted, be sure to ask Mr. Backe for help.

Also, if there is anything that I may have missed out in writing this post, please tell me and I'll fix it right away!

Now, the person who will do the next blog post is...

Yes, I chose you.

Don't forget to do your homework and study for Wednesday's test!