###
Pythagorean theorem

In a right triangle, the sum of the squares of the legs is equal to the length of the hypotenuse squared. a²+b²=c²

###
Pythagorean triple

a set of nonzero whole #'s a, b, and c that satisfy the equation a²+b²=c²

###
Converse of the pythagorean theorem

if the square of the length of one side of a triangle is equal to the sum of the squares of the lengths of the other two sides, then the triangle is a right triangle.

###
45-45-90

A triangle where both legs are congruent and the length of the hypotenuse is √2 times the length of a leg.

###
30-60-90

A triangle where the length of the hypotenuse is twice the length of the shorter leg and the length of the longer leg is √3 times the length of the shorter leg.

###
tangent

opposite/adjacent

###
cosine

adjacent/hypotenuse

###
identity

a type of equation that is true for all the allowed values of the variable.

###
angle of elevation

the angle formed by a horizontal line and the line of sight to an object above the horizontal line

###
angle of depression

the angle formed by a horizontal line and the line of sight to an object below the horizontal line

###
vector

any quantity with magnitude and direction

###
magnitude

corresponds to the distance from an initial point to the terminal point

###
initial point

one point of a vector

###
terminal point

second point of a vector

###
resultant

the sum of two vectors

###
adding vectors property

<x₁+x₂ , y₁+y₂>

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.