# math ch 1

## 34 terms

### inductive reasoning

reasoning based on patterns you observe

### conjecture

a conclusion you reach using inductive reasoning

### counterexample

an example for which the conjecture is incorrect

### isometric drawing

a drawing of a 3-D object that shows the corner view of the figure drawn on isometric dot paper

### orthographic drawing

the top view, front view, and rightside view of a 3-D figure

### foundation drawing

the base of a structure and the height of each part

### net

a 2-D pattern you can fold to form a 3-D figure

a location

### space

the set of all points

### line

a series of pts. that extends in 2 opp. directions never ending

### collinear points

pts. not on the same line

### plane

a flat surface that has no thickness

### coplanar

2 pts. or lines that lie on the same plane

### postulate/axiom

an accepted statement or fact

### segment

the part of a line consisting of 2 endpts. and all pts. btwn them

### ray

a part of a line consisting of 1 endpt. and all the pts. on 1 side of an endpt.

### opposite rays

2 collinear pts. w/the same endpt.

### parallel lines

coplanar lines that don't intersect

### skew lines

noncoplanar, nonparallel lines that don't intersect

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### coordinate

a point's distance and direction from 0 on a #line

### congruent segments

segments w/the same length

### midpoint

a pt. that divides a segment into 2 congruent segments

### angle

formed by 2 rays w/the same endpt. The rays are the sides of the angle; the endpt. is the vertex of the angle.

### acute angle

a measurement btwn 0 degrees and 90 degrees

### right angle

a measurement exactly 90 degrees

### obtuse angle

a measurement btwn 90 degrees and 180 degrees

### straight angle

a measurement exactly 180 degrees

### congruent angles

2 angles w/the same measure

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### compass

a geometric tool used to draw circles and parts of circles called arcs

### perpendicular lines

2 lines that intersect to form right angles

### perpendicular bisector

bisector of a segment that

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