# Math Chapter 8

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### Transformation

An operation that changes one figure into another figure.

### Reflection

A transformation that creates a mirror image of a figure

### Translation

A transformation that slides a figure

### Dilation

A transformation that stretches or shrinks a figure

### Obtuse Triangle

A triangle with one angle greater than 90 degress

### Scalene Triangle

A triangle with no congruent sides

### Rhombus

A parallelogram with 4 congruent sides

### Parallelogram

A quadrilateral with both pairs of opposite sides parallel

A closed geometric figure made up of 4 line segments, called sides, that intersect only at their endpoints

### Regular Polygon

A polygon with all sides equal in length and all angles equal

### Polygon

A closed figure whose sides are line segments that intersect only at their endpoints

### Pentagon

A polygon with 5 sides

### Octagon

A polygon with 8 sides

### Congruent Segments

Segments that have the same length

### Congruent Angles

Angles that have equal measures

### Heptagon

A polygon with seven sides.

### Complementary Angles

Two angles whose measures have a sum of 90 degrees.

### Line Symmetry

A figure that when cut in half has a mirror image of the other half.

### Parallel

Two lines on the same plane that never intersect.

### Equilateral Triangle

A triangle with three congruent sides.

### Acute Angle

An angle whose measure is less than 90 degrees.

### Right Angle

An angle whose measure is exactly 90 degrees.

### Trapezoid

A quadrilateral with exactly one pair of parallel sides.

### Isosceles Triangle

A triangle with at least two congruent sides.

### Perpendicular Lines

Two lines that intersect to form a right angle.

### Straight Angle

An angle whose measure is exactly 180 degrees.

### Supplementary Angles

Two angles whose measures have a sum of 180 degrees.

Example: