Geometric Mean

Something that plagues many geometry students is geometric mean. To be perfectly honest, there are few real life applications for this, but here we go:

Geometric Mean of Two Numbers:
If a question states something such as:

       Find the geometric mean of 75 and 10.

This is how you would write it out:

 x  = 10 
75     x

To solve, you would first cross multiply, or multiply diagonally.

x² = 750

Did you follow?
Now we are going to do the square root of both sides in order to get 'x' by itself:

x = 27.4 (Rounded to tenth)

If I was confusing, which I often am, comment, and I will attempt to clarify!

Khan Academy

One of the most efficient ways to understand math is to head on over to Khan Academy. They area great learning resource for students of all levels. Make sure to check it out!

Please!

As you can tell by my lack of recent posts, I have run out of ideas of things to post here. If you are viewing this, and really want meto continue, then please please please comment and leave ideas of things I could post about to either help you understand orsomething that you believe many people struggle with.
   Thank You
~dem0nd~

Math Help Needed?

If you have math help that just tell me what you want me to go over in the comments andI shall review it for you. Comment!

Definition of Supplementary Angles

Supplementary angles are extremely easy to understand. All that supplementary angles are, are two angles that equal 180 degrees.

<4 and <1 are supplementary.
<8 and <3 are supplementary.
<7 and <8 are supplementary.

If you have any questions, then, as usual, just comment!

Definition of Linear Pairs

Linear pairs are basically two angles that are adjacent and form a line. Adjacent simply means that they share a side.

Source

<1 and <4 form a linear pair.
Linear pairs are supplementary angles,meaning that when added together the form 180 degrees. One thing that you have to remember is that linear pairs  have to form lines. <1 and<4 form line l.

<1 and <3 form a linear pair. They form line t.
<2 and <7 form a linear pair. They form line m.

There are a few more, see if you can find them!

If you have any questions than comment!

Definition of Vertical Angles

Vertical Angles are formed when you have intersecting lines:

Source

Vertical angles, plain and simple, are the angles opposite of each other. The second thing that you have to know is that vertical angles are congruent, they have the same measure.

<1 and <8 form a vertical pair.

If <1=70, then <8=70 as well.

<2 and <5 form a vertical pair.

<3 and <4 form a vertical pair.

<6 and <7 form a vertical pair.

As usual, if you have any questions just comment!

Point, Plane, and Line Postulates

This is a series of pretty basic statements, so just hang in there.

1.) Any two points make a line. No matter where those two points are, they will always* make a line. Also, whenever you label a line, you label it with two points.

2.) When you have two intersecting lines, where they cross is exactly one point, no more, no less.

3.) Any three points that are non-col-linear make up a plane. A plane is always labeled with three points. A plane contains 3 or more points but is only labeled with three.

4.) If two points lie within a plane, then the line they form is also in the plane.

5.) If two planes intersect, they form a line at the intersection. If three insect, the intersection is a point.

If you have any questions, just ask of course!

Segment Addition Postulate

The Segment Addition Postulate is a very simplistic geometry term. All that the Segment Addition Postulate is saying is that when you have three co-linear points, the first piece of the segment, plus the second equals the whole. To clear that up a bit:

Source^

___   ___    ___

AB + BC = AC

Questions? Comment!