# Geometry Chapter 1 Vocabulary

### 19 terms by nicolekanani28

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### conjecture

an unproven statement that is based on observations

### point

has no dimension. usually represented by a small dot

### line

extends in one dimension. usually represented by a straight line with two arrowheads to indicate that the line extends without end in two directions

### plane

extends in two dimensions. usually represented by a shape that looks like a tabletop or wall

### line segment

part of a line that consists of two endpoints and all points on the line that are between the endpoints

### ray

part of a line that consists of an initial point and all points on the line that extend in one direction

### initial point

the starting point of a ray

### postulate

rules that are accepted without proof. also called axioms

### congruent segments

segments that have the same length

### congruent angles

angles that have the same measure

### acute angle

an angle with measure between 0 and 90 degrees

### obtuse angle

an angle with the measure between 90 and 180 degrees

### right angle

an angle with measure equal to 90 degrees

### straight angle

an angle with measure equal to 180 degrees

### segment bisector

a segment, ray, line, or plane that intersects a segment at its midpoint

### angle bisector

a ray that divides an angle into two adjacent angles that are congruent

### vertical angles

two angles whose sides form two pairs of opposite rays

### complementary angles

two angles whose measures have the sum of 90 degrees

### supplementary angles

two angles whose measures have the sum of 180 degrees

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