Theorem of three perpendiculars - Lesson
- Author:
- Simona Riva
- Topic:
- Geometry
Let P be a point on a plane .
Draw the line r, perpendicular to plane in P, then a new line t in the same plane.
Now draw the line s, perpendicular to t through P.
Draw the plane , through r and s.
the plane is perpendicular to line t.
Move the points in the construction and explore the theorem.