unit 1 vocab Flashcards
line
goes through all points in between and continues forever
ray
an end point and continues forever in one direction
segment
2 end points and all points between
parallel
> >
perpendicular
intersect at a 90 degree angle - square in angle
congruent
same size and shape - one I through it or half circle if its an angle
bisect
to divide in half in 2 equal parts
- anything that goes on forever on either side cannot be bisected
midpoint
the point in a segment that divides the segment into 2 equal parts
midpoint formula
average x’s and y’s
segment addition postulate (SAP)
B = between A and C
AB + BC = AC
sides
the two rays or segments of an angle
vertex
the common endpoint (intersection) or the rays
adjacent
angles that share a vertex and a common side (but no common interior space)
angle addition postulate
B = lies in interior of angle MLK
angle MLB + BLK = MLK
acute angle
angles that measure between 0 and 90 degrees (doesn’t include 0 or 90 degrees
right angle
an angle that measure 90 degrees
obtuse
angles that measure between 90 and 180 degrees
straight
angles that measure 180 degrees
postulate
statements that are accepted as true without proof
theorem
must be proven (using definitions, postulates, and other theorems)
exists
must be at least one
unique
at most 1
one and only one
must be exactly one
standard form
Ax+ By = C
