Wednesday, April 29, 2009

Well today wasn't the most productive day just because of the fire bell. But still we still did manage to get some work done. First we reviewed homework I myself learned a few new things for example.

The word COLLINEAR which when you break it down CO as in two and LINEAR meaning line

Here is an example of it

Vector AB is collinear to Vector BC, this works
because Vector AB is on the same line as BC.

Another thing I learned is that vectors must have an arrow above them when you write it or else it's not a vector just a line for example

And so forth, without the arrow it's just not a vector

So anyway besides homework review we also reviewed some trigonometry turns out we really need it in this unit. Some important ones included Pythagorean theorem , sin law and cosine law.

We then learned some useful properties of angles for example Opposite angles, and Alternate angles, Corresponding angles

So from what I gathered when two lines cross each ot
her they make 4 angles now if you label two angles say A and B it will look like this

Though i am not sure why we do this but Mr K told me that across from angle A will also be angle A and across from angle B will also be B sort of like this.

That's the rule for opposite angles

Now the next is Alt
ernate angles, now this to I also have trouble with so bear with me

Now from what I understand top left corner A
is equal lower right corner A and vice versa for B

So basically by knowing the alternate angle rules
the top right B angle is 120 degrees and the top left A angle is 60 degrees

And that is how you use the alternate angle rule

Lastly now were going to take a look at corresponding angles which looks like this

Kind of like alternative but your looking at what I guess is angles on the same side. For example this picture (B angles being on the same side and A angles on the same side)

So just like all the other rules each angles are completely the same what I mean by this is

If that is 110 degrees then that must mean the B angle is also 110 degrees and if that is 80 degrees then the A angle must be 80 degrees as well.

And this concludes my scribe sorry if it isn't informative as you all might have hoped it would be but I am still trying to get my head around this whole concept. The next scribe I choose is



Daniel said...

Yo, henson!

That was pretty informative, but in your last example, if the first angle was 110, the second angle would have to be 70. Since it's two parallel lines being crossed, those "a"s and "b"s have to add up to 180!

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