Rotate!
I want to show the location of triangle B'C'D' after it is rotated 120 degrees clockwise.
The points are ready for you...you just need to move them to the correct location!
"alpha" represents the angle from B to A to B' (angle BAB')
"beta" represents the angle from C to A to C' (angle CAC')
"gamma" represents the angle from D to A to D' (angle DAD')
Steps
1) The first angle ( alpha) is already turned on for you. Notice the green circle on the left. Move point B' until it reads 120 degrees.
2) Turn off alpha by clicking the green circle. Turn on beta by clicking the empty circle below alpha (it should turn blue)
3) Move point C' until it reads 120 degrees.
4) Repeat steps 2 and 3 by turning off , turning on (it should turn red) and moving point D' until it reads 120 degrees.
5) Select the polygon tool 
and click B' to C' to D' and back to B' to form a triangle!
and click B' to C' to D' and back to B' to form a triangle!Let's check your work!
1) Select the rotate tool 
2) Click in the center of triangle BCD (try to avoid points, line segments and circles)
3) Click on the center of rotation A
4) Type in 120 and select clockwise!
2) Click in the center of triangle BCD (try to avoid points, line segments and circles)
3) Click on the center of rotation A
4) Type in 120 and select clockwise!