Hi there,

Please review/help me fill in my guide to make sure it's right.

**Geometry **
point - a location in space

line - a collection of points

infinite - never ending

plane - a collection of lines (flat surface)

space - the collection of all planes

collinear - points in the same line

non-collinear - points not on the same line

co planar - points or lines on the same planes

non co-planar - points or lines not on the same plane

intersect - cross (meet at a point)

-------------------------------------------------------------------------

**Distance**
Distance - Length of a segment. Distance formula -

d= x2-x1 (2) + y2-y1 (2)

**Midpoint**
Midpoint - Point in the middle. Midpoint formula -

m = a+b

----

2

**more vocab**
ray - piece of a line w/ one end point

angle - the union of two rays at one end point

angles measure in degrees

acute angles are smaller than 90 degrees

right angles are 90 degrees

straight angles are 180 degrees

obtuse angles are bigger than 180 degrees

-------------------------------------------------------------------------

here's where I am starting to have some troubles.

Please help if you can.

bi sector - cuts a segment or angle in half.

adjacent angels - have a common side and a common vertex (side by side) no common interior points.

vertical angles - common vertex, no common ?

linear pair - have a common vertex and form a straight line.

complementary angles

2 c's that add up too 90 degrees . ex: 15 degrees and 75 degrees.

supplementary angles - 2 c's that add up to 180 degrees. ex 10 degrees and 170 degrees

perpendicular lines - intersecting lines that form a right L

OK, Here's where I need help please
The math portion

http://i38.tinypic.com/2ii768n.jpg
I don't understand this, please help

Thanks