Where I Am .

For me, this unit was pretty confusing most times. These are my muddiest points :

- factoring long expressions or equations
- a bit having a hard time to follow

all in all, i need some more reviewing and explaining .

Friday, November 21st, 2008

Today Mr. K first off talked about the blog, telling us how to write label's properly because if you don't, then you won't get the mark's that you deserved for it. Then he moved on mentioning to us that since we were having difficulty with vocabulary, he now will add onto the blog something that will help us out. This is a site found in the right hand side of the blog with a link called "wordequationswiki" sort of like wikipedia, only this time we could add on word's that we don't understand, ourselves to this site.

Our next unit that we began since we had to move on, is called Geometry. For this unit we need to know volume of a cylinder and sphere formula's. There is also another one that we also need to know about, and it is called the baseball theorem. For example, if you take a baseball and cut all the stitches, and then unfold it, it would have 4 circles. And these 4 cirlcles is what is used to find out the surface of a sphere. This is because if you take the 4 circles multiply it by pie and also multiply the radius by itself 2 times, then you would get the surface of a sphere. Note when multiplying with pie you can't just multiply it with just "3.14". You can't just do that you have to use the whole thing because if you were to use "3.14" that'll only be close to pie unlike if you use the whole thing "3.141592654" your answers will be fully correct.

To get us started with Geometry Mr. K gave us an example:

EX) A sphere fits exactly inside a cylinder. Find the volume of each of the size's of cylinder's with spheres inside them. Is there a relationship or a pattern?

First off you have to find the height of the cylinder. You get the height of the cylinder by the diameter of the sphere. And then once that is settled, for all the 3 size's you plug in the measurement's in the formula. For the volume of cylinder formula this is what it would be like : . For the volume of sphere formula it would look like this :

Let's start off with the smaller size first to get you help started and to show you how to do it for the other sizes .

First find the volume of the cylinder:

VCYL =

=

=
= 50.2654

Then find the volume of the sphere inside :

VSPH =
=
=
= 33.5103

VCYL = = 50.26

VSPH = = 33.51

Now do the same method for the medium and the large sizes, which will give us:

Medium Sized:

VCYL =

VSPH =

Large Sized:

VCYL =

VSPH =

In conclusion, using the medium size one, one and a half spheres fit in each cylinders :

===

Our assignment for today was Excercise 23, Questions: All. A reminder on Monday, November 24th 2008, is our test on Radicals and Exponents, so study hard.

And our next scribe is caseyh.

Personal Muddiest Point .

My weakest point in this unit is :
- writing radicals in simplest form with a rational denominator
- understanding fully without proper notes and needs a lot of examples
- knowing some of the vocabulary meanings in this unit

Where I Am In Pre-Cal .

The unit's or part's of the unit's that I'm having trouble with are the beginning of Exponents and Radicals, and a little bit with factoring .
I liked doing Trigonometry because it was pretty okay for me and I didn't really have a hard time with it.
I hated polynomials and factoring because it sort of threw me off at first but i got used to it near the end.
All in all, it takes me time to learn thing's, but near the end that's when I am sort of well known with the whole unit. But once I learn a unit and then we move on to another unit I seem to forget a bit what the other past unit's were like

Friday, September 26th, 2008

Heey, today Dr. Eviator went over Excercise 7: Ques 1-3, 5-7 with the class. Our assignment is to do whatever we were supposed to finish today and also Excercise 7: 11, 16, 17 and Excercise 8: 6, 7. Here they are:

Excercise 7: 11, 16, 17:

11) AB = 3, BC = 4, DE = 10
How long is DC?

16) Find the length and midpoint of segment PQ given P(3, 2) and Q(-1, 4).

17) The midpoint of AB is M(1/2, 6). Given A(3, 7), find the coordinates of B.

Excercise 8: 6, 7:

6) Select any point on a sheet of graph paper, and call it A. Move two units to the left to point B. From there move five units up to point C and three units right to point D.

a) Find the slope of AD.

b) Find the distance between A and D.

7) What is the slope of

a) the x-axis?

b) the y-axis?

annnnd the next scirbe for monday is . . . arvee.