# Algebra 1

### 25 terms by lotsofbooks12

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### mixed number

A mixed number is the sum of a whole number and a fraction.

### intersect

when two lines cross

### point of intersection

the place where the lines cross

### parallel lines

if two lines in the same plane do not intersect

### perpendicular

if two lines make square corners

two right angles

### acute angle

an angle smaller than a right angle

### obtuse angle

an angle smaller than a right angle

### polygon

the number of sides is always equal to the number of vertices

### side

each segment of a polygon

### vertex {plural: vertices}

endpoint of a side

### concave polygon

if a polygon has a indentation

### convex polygon

any polygon that does not have an indentation

### parallelogram

quadrilateral that has two pairs of parallel sides

### trapezoid

is a quadrilateral that has exactly two parallel sides

### rhombus

equilateral parallelogram

### square

rhombus with four right angles

### perimeter

measure around or distance around

distance from the center of the circle

### diameter

twice the length of the radius

### circumference

perimeter of a circle

### circumference of a circle

pi D=pi(2r)=2(pi)r

### infinte numbers

(1, 3, 5, 7 ....)

(1, 3, 4, 6 )

Example: