# Geometry Vocabulary

## 25 terms · chapter 10 vocabulary

are a pair of angles with a common vertex and a common side, but no common interior points

### alternate exterior angles

Angles that lay outside the parallel lines and are on opposite sides of the transversal; They are congruent.

### altitude

a perpendicular segment from a vertex to the line containing the opposite side

### base

any side of a parallelogram; the altitude is perpindicular to the base

### circle

The set of all points in a plane that are the same distance from a given point called the center

### circumference

The distance around a circle

### complementary angles

two angles whose measures have a sum of 90 degrees

### composite figures

a figure that can not be classified as a single polygon or circle

### congruent

figures that have the same size and shape

### corresponding angles

Angles that have the same position on two different parallel lines cut by a transversal

### diameter

the length of a straight line passing through the center of a circle and connecting two points on the circumference

### dilation

A transformation that changes the size of an object, but not the shape.

### parallel lines

lines in the same plane that never intersect

### parallelogram

a quadrilateral whose opposite sides are both parallel and congruent

### perpindicular lines

lines that intersect to form right angles

a four-sided polygon

the length of a line segment from the center of a circle to a point on the circle

### reflection

A transformation that "flips" a figure over a mirror or reflection line.

### regular polygon

a polygon with all sides and all angles congruent

### rhombus

a parallelogram with four equal congruent

### supplementary angles

two angles whose measures have a sum of 180 degrees

### transformation

a movement of a geometric figure that may change the size or position of the figure

### translation

A movement of a figure along a straight line

### trapezoid

a quadrilateral with exactly one pair of parallel sides

### vertical angles

a pair of opposite congruent angles formed by intersecting lines

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