# Mrs. Reisch H Vocab

## 29 terms

### point

an exact position or location

### line

made up of points, is straight, and extend infinitely in each direction

### line segment

made up of point and are straight, has definite beginning and end

### ray

made up of points, is straight, has definite start point than extends infinitely far in one direction

### angle

made up of 2 ray with a common endpoint

### vertex

the point where 2 rays meet

### union

everything 2 sets have combined

### intersection

where 2 lines meet

### acute angle

angle whose measure is greater than 0 and less than 90

### right angle

angle measures 90 degrees

### obtuse

angles measure is greater than 90 and less than 180

### straight angle

angles measure is 180

### minutes

an angle degree is divided into 60 minutes

### seconds

each minute of an angle is divided into 60 seconds

### congruent angles

angles that have the same measure

### congruent segments

segments that have the same length

### collinear

points that lie on the same line

### theorem

a mathematical statement that can be proven

### midpoint

the point of bisection of a segment

### bisector

a point, segment, ray, or line that divides a segment into 2 congruent segments

### counter example

a case in which a conclusion is proven flase

### postulate

an unproved assumption

### conditional

where p and q are declarative statements, p->q

### hypothesis

the "if" part of the conditional

### conclusion

the "then" part of the conditional

### negation

opposite, not p, ~p

### converse

reverse parts, q->p

### inverse

negate each side, ~p->~q

### contrapositive

flip and negate, ~q->~p