Download Course 2 Lesson 7

Course 2 Lesson 7
Geometry – study of space and all the figures that
occupy it
Space – three-dimensions (has length, width and depth)
Plane – two-dimensional that has length and width but
no depth
Point—one point in space it is unmeasurable. Use a dot
to represent a point and name it with a capitol
letter
Line – one-dimensional that has length but not width or
depth Name a point with two capital letters and a
line with arrows over it
Ray – part of a line with one end point
Segment—part of a line with two endpoints Segments
are measurable!!
Segments have special notation to represent their
measure
Intersect – when two lines on the same plane cross
Perpendicular lines—when two intersecting lines meet
at a right angle or 90 degrees
Intersecting lines that don’t meet at 90 degrees are
oblique.
Parallel lines – lines that are in the same plane and will
never intersect.
Skew lines – lines that are NOT in the same plane and do
NOT intersect
Angles – two rays that share the same endpoint
Vertex – the point where two rays meet
Right angle—angels formed when the rays meet at right
angles or 90 degrees
Acute angles—angles formed when rays meet at an
angle less than 90 degrees
Obtuse angles – angles formed when rays meet at an
angle greater than 90 degrees and less than 180
degrees
Straight angle – angles formed when rays meet at an
angle equal to 180 degrees