# Math Vocabulary 10-12

## 20 terms

### congruent

having exactly the same size and shape

### diagonal

A line segment that connects two vertices of a polygon and is not next to each other

### growing pattern

a pattern in which the number or figure increases or decreases each time

### repeating pattern

a pattern in which the pattern unit is used over and over again

### line of symmetry

a line that divides a figure into two congruent parts

### pattern unit

the part of the pattern that is repeated

### acute angle

an angle that measures less than a right angle (90 degrees)

### angle

formed by two rays that share the same endpoint

### closed shape

a two-dimensional shape that begins and ends at the same point

### line

a straight path extending in both directions with no endpoints

### obtuse angle

an angle that measures greater than a right angle (90 degrees) and less than a straight angle (180 degrees)

### open shape

a shape that does not begin and end at the same point.

### plane shape

a shape on a flat surface that is formed by curves, line segments, or both.

### point

an exact location or position

### polygon

a closed plane shape with straight sides

### right angle

an angle that forms a square corner and measures 90 degrees

### two-dimensional shape

plane shapes that have length and width

### century

a meaasure of time that equals 100 years