A point is an exact location in space. You are here.
A true point has no length, no width, and no height. In fact, you cannot see a true point.
A point is named by a letter. Point P P
Lines are 1-dimensional objects that have only length. Lines continue forever in both directions.
Because a line has no width or height, you cannot see a true line.
A line is defined by 2 points. A B Line AB
A ray of light has a starting point (like the sun) and continues forever in the same direction.
Of course, if the ray hits an object, the light could be absorbed or reflected. MIRROR
A ray is also defined by 2 points. C D Ray CD
A line segment has a starting point and an ending point. Line segments can be measured.
A line segment also defined by 2 points. E F Line Segment EF
When lines intersect to form right angles, they are said to be perpendicular. R UT RV c S T U V
Is it possible for lines not to intersect and not be parallel either?
Believe it or not, this is possible.Let’s consider a 3-dimensional rectangular prism.
These 2 lines are not parallel, but they are not intersecting either.
You might have heard the word “skewer” the last time you had a barbecue. S K E W E R
A skewer raises your “dinner” off the surface of the grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.
Lines can be… intersecting skew parallel perpendicular 90º
A plane is a flat surface that has length & width but no height.
Planes can intersect.
Planes can be perpendicular.
Planes can be parallel.
Planes can be… intersecting parallel perpendicular