Question

how can we memorize easily the radians of unit circle

Answer 1

I have a method

Answer 2

oh is this a tutorial?

Answer 3

or do you really want to know an easy way to memorize the unit circle?

Answer 4

http://coolmath.com/precalculus-review-calculus-intro/precalculus-trigonometry/28-the-unit-circle-01.htm

Answer 5

First the pattern of radians,

all the radian numbers multiplied by pi as you go along around the circle counter clockwise can be remembered by this simple pattern:

-> 2 3 5
4 5 7 <-
-> 5 7 11

remember pi/2 and 3pi/4 are on the top and bottom respectably

and closer to the verticle lines it is pi/3 and closer to the horizontal lines it is pi/6
middle is pi/4

Next remember cos = x and sin = y

the coordinates are easy for each just count

just square each number on the top and divide by 2

you can easily remember what is negative by knowing that all positive x values are to the right of the vertical line, and all negative x values are to the left of the vertical line.

positive y values are above the horizontal line and negative y values are below the horizontal line