Chapter 1's Top 5 Concepts

Remembering things from all the way back into the beginning of the school year can be a real hassle. The top 5 things from chapter 1 that you are most likely to forget are listed on this page for your help!!

Definitions

• Undefined Terms - point, line and plane. These terms have no official definitions, they are basically what they are.
• Noncoplanar Points - points that do not lie on the same plane.
• Bisector - point, line, or ray that cuts a line or angle exactly in half.

The Midpoint Formula

• ( x , y ) = {( x1 + x2 / 2) , (y1 + y2 / 2)}
• The midpoint formula is used when trying to fine the middle of a line segement. The midpoint is the point that cuts a line exactly in half.

Circumference of a Circle

• C = 2 ð r ² or C = ð d (( ð = pi , d = diameter , r = radius))
• The circumference of a circle is the perimeter around the given circle.
• **d = the diameter (line segment) through the middle of the circle, r = half the diameter