has no size and is the simplest geometric figure.
All geometric figures consist of
is understood to be a straight line that extends in both directions without end.
can be thought of as a floor or a tabletop, except that a plane extends in all directions without end and has no thickness.
Given any two points on a line, a line segment is
the part of the line that contains the two points and all the points between them.
Given any two points on a line, a line segment is the part of the line that contains the two points and all the points between them. The two points are called
congruent line segments
Line segments that have equal lengths
The point that divides a line segment into two congruent line segments
line segments BC and CD are
point c is
halfway between B and D, point C is the midpoint of line segment BD.
Sometimes the notation AB denotes line segment AB, and sometimes it denotes the
length of line segment AB
When two lines intersect at a point, they form
When two lines intersect at a point, they form four angles. Each angle has
a vertex at the point of intersection of the two lines.
APC and BPD, are called
opposite angles, also known as vertical angles
Opposite angles have
angles that have equal measures
Sometimes the angle symbol is used instead of the word
Two lines that intersect to form four congruent angles
Two lines that intersect to form four congruent angles are called perpendicular lines. Each of the four angles has a measure of
An angle with a measure of 90º is called a
An angle with measure less than 90º
an angle with measure between 90º and 180º
Two lines in the same plane that do not intersect
when two parallel lines are intersected by a third line it formes ...... angle/s
Label the angles of two parallel lines intersected by a third line
a closed figure formed by three or more line segments