Geometric Construction Perpendicular Line through given point
Follow these steps to complete your construction.
1) Construct a circle using the "Circle with Center through Point" tool by clicking on C, then clicking on point D on the line.
2) Construct a point at the second intersection of the circle and the line. (It should be E)
3) Construct a circle using the "Compass" tool with radius CD and center D.
4) Construct a circle using the "Compass" tool with radius CE and Center E.
5) Construct a point at the lower intersection of the two circles you constructed in steps 3 & 4. (Call this point F)
6) Construct a line that passes through C and F.