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vector

the direction or course followed by an airplane, missile, or the like

initial point

starting point

terminal

ending point

matrix

a rectangular array of elements (or entries) set out by rows and columns

rows x columns

rows x columns or columns x rows?

element

each piece of information in a matrix

dimensions

the rows by columns of a matrix

when multiplying matrices, what must be the same?

same columns in first matrix as rows in second

same dimensions for both matrices

when adding matrices, what must be the same?

similar polygon

multiply a matrix by a scaler to create a _______

scaler

what operation is this: [2 3]x4=[8 12] ?

1 0

matrix for reflecting over x-axis

-1 0

matrix for reflecting over y-axis

0 1

matrix for reflecting about the line y=x

0 -1

matrix for rotating 90° about the origin COUNTER-clockwise

Circle

r= asin(theta)

radius

From center to a point on the circle.

Chord

is a segment whose endpoints lie on the circle

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

Tangent Line

a line that intersects the circle at only one point on the same plane

Secant Line

a line that intersects a circle at two points on the same plane

tangent circle theorem #1

in a plane, a line that intersects a circle at exactly one point is perpendicular to the radius

tangent circle theorem #2

tangent segments from a common external point are congruent

Central Angle

an angle whose vertex is the center of the circle

semi circle

an arc with endpoints that are the endpoints of the diameter

minor arc

smaller than a semicircle; named by its endpoint with an arc symbol over the letters - ⌒

major arc

larger than a semicircle; named by its endpoints and another point between the endpoints on the arc with an arc symbol over the letters - ⌒

arcAB+arcBC=arcAC

arc addition postulate

congruent circles

circles with congruent radii

congruent arcs

arcs with the same measure or length

degrees

a unit for measuring angles