The blog will also be a record of what concepts my children learn. I need a place to put this besides random pieces of paper spread all over the place. So with that stated, this blog post will be definitions in Geometry I have covered with some small person that lives with me. These definitions are really for me. I hate looking back in the book because I forgot something I just looked at two seconds ago.
Line- a straight line. Arrows going in both directions means continuous line.
Point- a specific location on a line.
Plane – three or more points that are not on the same line. Makes up a flat surface.
Postulates- statements that are accepted as true.
Theorems- can be proven true through a series of steps.
Line segments- is a part of a line.
Midpoint- is a point that is midpoint between two other points on a line.
Rays- is a section of a line that has a beginning point and continues on forever.
Parallel Lines- two line that do not cross each other.
Intersecting lines- line that cross each other.
Bisectors- lines that cross each other at the midpoint.
Transversals- a line that intersects two other lines.
Vertex- the point of the angle.
Bisecting rays- divides one larger angle into two angles of equal parts.
Supplementary angles- two angles that add up to 180 degrees.
Right angles- 90 degrees angles.
Complementary angles- two angles that add up to 90 degrees.
Perpendicular lines- two lines that intersect and make right angles.
Acute angles- less than 90 degrees angle
Obtuse angle- greater than 90 degrees but less than 180 degrees angle.
Adjacent angles- angles that lie next to each other.
Vertical angles- angles that are opposite of each other.
Congruence- when two angles are equal.
Corresponding angles- when a transversal line cross two are more lines.