Math

• Geometry came from the greek word "geo" which means earth and "metron" means measurement
• Geometry is the measurement of the earth
• Undefined terms does not have a description
• Point has no size no dimension and merely position
• Line contains 2 or more points and it has infinite length
• Line contains 2 arrow heads
• Plane is a flat surface with no thickness that extends without end in all directions
• Plane contains 3 or more points
• Coplanar is the points that lie on the same plane
• non-coplanar is the points that do not lie on the same plane
• collinear is the points that lie on the same line
• non collinear is the points that do not lie on the same line
• intersecting lines - 2 lines with a common point
• perpendicular lines- they intersect to form four right angle
• parallel lines - lines that do not intersect
• line - infinite length
• segment has end points
• ray has 1 end point and 1 arrow head
• midpoint divides a segment into 2 congruent segments
• angles union of 2 noncollinear rays that have a common endpoint
• vertex is where to lines meet
• slides are rays
• initial side - fixed side and it is horizontal
• terminal side- movable ray
• acute - less than 90 degrees
• right angle - 90 degrees
• obtuse - greater than 90 but less than 180 degrees
• straight angle - 180 degrees
• reflex- greater than 180 degrees but less than 360 degrees
• angle pairs - appear in two to display a certain geometrical property
• complementary angles - add up to 90 degrees
• adjacent angles - share the same vertex and side, but not an interior point.
• supplementary angles - add up to 180 degrees
• vertically opposite angles - are on different sides of transversal line
• linear pair - 2 angles that are adjacent and supplementary
• transversal - line that intersects 2 or more lines
• corresponding angle - lie on the same side of the transversal in corresponding position
• alternate interior - lie inside on opposite sides of the transversal
• alternate exterior - lie outside on opposite side of the transversal
• same side interior - lie inside and same side of the transversal and is equal to 180 degrees