# Geometric Mean, Trig, Vectors, Other Such Torture...

### 12 terms by lastxtrainxhome

#### Study  only

Flashcards Flashcards

Scatter Scatter

Scatter Scatter

## Create a new folder

this is a test where having lots of colors would be useful, because otherwise everything looks confusing.

### leg of right triangle is geom mean

btwn piece of hypot next to it and length of full hypot

### altitude is geom mean

btwn the 2 pieces of the hypot

### trig functions

SOH CAH TOA. that is all.

### law of sines

If you know an angle and the measure of opp side:
sinA/a = sinB/b = sinC/c

### law of cosines

if you have info about all 3 sides or side angle side:
a^2 = b^2 + c^2 - 2bc(CosA)

### vector

basically, a directed line segment
written like <x,y> (btw this is called component form)

### magnitude

length of a vector
usually you can use pythagorean theorum to find this.

### direction

the angle that the vector makes with a horizontal line. measured clockwise from x axis. usually involves N,S,E,W because Draz likes word problems a lot.

### equal vectors

have same magnitude and direction

### parallel vectors

have the same or opposite direction

### resultant vector

the sum of 2 vectors. you just add them.

tan^-1(x/y)

Example: