This plot was created with Gnuplot.

# Author: Ika
# Date: 12/23/2014

set term jpeg font 'Times, 18' size 1000,1000
set output 'circle_transport01.jpg'
theta = 2*pi/36*0
# The ratio of the height and width of the plot chart is 1/5 = 0.2.
set size ratio 1
set xrange [-1.5:1.5]
set yrange [-1.5:1.5]
# Unit along the axes
set xtics 1
set ytics 1
unset grid

unset label
set key off

set arrow 1 from cos(theta), sin(theta) to cos(theta)-0.5*sin(theta), sin(theta)+0.5*cos(theta) lw 3 lc rgb "red"
set parametric                              
set trange [-pi:pi]
plot cos(t), sin(t) lc rgb "blue" lw 2

set term x11
set output

I, the copyright holder of this work, hereby publish it under the following licence:

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International licence.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.

https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue