00:01
All right, so if we have a triangle abc that you want to rotate around a point that is not on the triangle like r, and you want to rotate it by a 60 degree angle counterclockwise.
00:17
So you need a ruler and protractor, of course.
00:20
So what you should do is you should draw a line from r to a, measure how long that line is, use the protractor counterclockwise, goes this way.
00:31
Make a line at 60 degrees, like so.
00:37
Measure this length, measure out, put a prime.
00:43
Then do the same thing, so draw a line from a to c.
00:47
Use the protractor to measure 60 degrees.
00:52
Measure the line, how long it is...