1.
acute angle: angle that opens less 90°
2.
angle: is formed by two rays with the same endpoint
3.
angle bisector: is a ray that divides an angle into two congruent angels. ots end point is at the angle vertex. within the ray, a segment with same endpoint is also an angle bisector.
4.
collinear: 3 or more points on the same line
5.
congruent: having equal measure
6.
conjecture: a conclusion you reach using inductive reasoning
7.
coplanar: points and or lines that lie on the same plane
8.
counterexample: the number or set of numbers or geometric figures that does not agree with the statement
9.
inductive reasoning: is reasoning that is based on patterns you observe. if you observe a pattern in a sequence, you can use inductive reasoning to tell what the next terms in the sequence will be.
10.
line: 1. extends in two directions indefinitely
2. has no width
3. represented by line, arrows, letters.
4. named by two capital letter OR one cursive letter
11.
midpoint: point in the middle of a segment., divides segment into ≅ segments.
12.
obtuse angle: an angle that opens more than 90°
13.
opposite rays: opposite rays are rays with the same endpoint. they form a line
14.
parallel: never intersect
15.
perpendicular: are two lines that intersect to form right angles. the symbol ⊥means "is perpendicular to"
16.
postulate: an accepted statement of fact (like a property)
17.
ray: is the part if a line consisting of one endpoint and all the points of the line on one side of the endpoint
18.
right angle: a right angle is an angle whose measure is 90.
19.
segment: is the part if a line consiting of two endpoints and all points between points
20.
skew: the werid ones, the oddy situated lines
non-intersect
not parallel
21.
straight angle: a straight angle isa nangle whose measure
