# Algebra flashcards Unit 7

## 32 terms

### Square

a parallelogram with 4 right angles and 4 congruent sides

a polygon with 4 sides

### Rotation

Transformation that turns a figure about a fixed point

### Center of Rotation

Transformation that turns a figure about a fixed point

### Line of symmetry

a line divides a figure with a reflectional symmetry into 2 congruent halves

### Regular Polygon

is a polygon with all its sides congruent and all its sides angles congruent

### Polygon

a closed plane figure with at least three sides

### Area

number of square units it encloses

### Formula

an equation that shows a relationship between quantities that are represented by variables

a circle is a segment that has one endpoint at the center of the circle and the other endpoint on the circle

### Circumference

distance around a circle. Calculate the circumference of a circle by multiplying the diameter by pie

### Square Unit

how many squares there are in a box to fill the entire thing

### Rectangle

a parallelogram with 4 right angles

### Obtuse triangle

an angle with a measure greater that 90 degrees and less than 180 degrees

### Reflection

transformation that flips a figure over a lone of reflection

### Angle of rotation

rotate it 180 degrees, or less, so that its image matches that original figure

### Circle

set of all points in a plane that equidistant from a given point, called the center

### Parallelogram

a quadrilateral with both pairs of opposite sides parallel

### Line of reflection

a line across which a figure is reflected

### Rotational Symmetry

has rotational symmetry if the figure can be rotated 180 degrees or less

### Diameter

a circle is a chord that passes through the center of the circle

### Equilateral Triangle

a triangle with three congruent sides

### Scalene Triangle

a triangle with no congruent sides

### Isosceles Triangle

a triangle with at least 2 congruent sides

### Right Triangle

a triangle with one right angle

### Acute Triangle

a angle with a measure less than 90 degrees

### Rhombus

a parallelogram with four congruent sides

### Altitude

any segment perpendicular to the line containing the base of a figure and drawn from the side opposite the base

### Trapezoid

a quadrilateral with exactly one pair of parallel sides

### Transformation

Transformation a change of position or size of a figure. 4 types of transformations are translations, reflections, rotations, and dilations

### Reflectional symmetry

when one half of the figure is a mirror image of the other half

### Translation

a transformation that moves points the same distance and in the same direction