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# Plane Geometry C1

### Wirtz Plane Geometry Carnegie Chapter 1

TermDefinition
polygon It is a two-dimensional figure that is formed by three or more segments called sides. Each side must intersect exactly two other sides, one at each endpoint. No two sides intersect each other more than once.
side (polygon) In a polygon, it is one of any of the line segments that form the polygon.
triangle It is a polygon with three sides.
quadrilateral It is a polygon with four sides.
pentagon It is a polygon with five sides.
octagon It is a polygon with eight sides.
perimeter It is the sum of all the side lengths.
area (polygon) In a polygon, it is the number of square units needed to cover the figure.
rectangle It is a parallelogram with four right angles.
length (quadrilateral) In a quadrilateral, it is the top to bottom distance.
width (quadrilateral) In a quadrilateral, it is the side to side distance.
base (rectangle) In a rectangle, it is the side to side distance.
height (parallelogram) In a parallelogram, it is the perpendicular distance between the two bases.
parallelogram It is a quadrilateral in which both pairs of opposite sides are parallel.
vertex (polygon) In a polygon, it is the point where two sides of the polygon intersect.
altitude A perpendicular segment that indicates the height of a figure. It is drawn from a vertex to the opposite side or to the line that contains the opposite side.
base (triangle) In a triangle, it is the side to which the altitude is drawn.
height (triangle) In a triangle, it is the perpendicular distance from a vertex to the side opposite the vertex.
trapezoid It is a quadrilateral with exactly one pair of parallel sides. The parallel sides are called bases and the nonparallel sides are called legs. The perpendicular distance between the bases is the height.
base (trapezoid) In a trapezoid, it is the parallel sides.
height (trapezoid) In a trapezoid, it is the perpendicular distance between the two bases.
regular polygon It is a polygon whose sides all have the same length and whose angles all have the same measure.
apothem It is the perpendicular distance from the center of a regular polygon to a side.
diameter It is the distance across the circle through the center. It is equal to twice the radius of the circle.
circumference It is the distance around a circle (like the perimeter of a polygon) and equal to pi multiplied by the diameter, d, or pi multiplied by twice the radius, r.
radius It is the distance from the center of a circle to a point on the circle.
irrational number It is a number that cannot be written as a/b, where a and b are integers.
area (circle) In a circle, it is the number of square units needed to cover the figure.
composite figures It is formed by two or more figures.
base of a geometric figure In a geometric figure, it is the side or face to which an altitude is drawn, or is considered to be drawn.