TITLE: calculate x,y positions in circle every n degrees
QUESTION [13 upvotes]: I am having trouble trying to work out how to calculate the $(x,y)$ point around a circle for a given distance from the circles center.
Variables I do have are:
constant distance/radius from center ($r$)
the angle from $y$ origin
I basically need a point ($x$ and $y$) around a circle every $18$ degrees.
Excuse me if this is a very basic question but math is not my strong point :/
Ta
John

REPLY [23 votes]: x = radius *  cos(angle)
y = radius *  sin(angle)

Inverse Y-axis:
x = radius *  sin(angle)
y = radius * -cos(angle)

If radians is used then
radian = angle * 0.0174532925

and
x = radius *  cos(radian)
y = radius *  sin(radian)

Radian is the standard unit of angular measure, any time you see angles, always assume they are using radians unless told otherwise.