In geometry, a point reflection or inversion in a point is a type of isometry of Euclidean space. An object in 2D which is invariant under a point reflection, possess point symmetry; if it is invariant under point reflection through its center, it is said to possess central symmetry or to be centrally symmetric. In 2D, a point reflection is the same as a rotation of 180 degrees.
Do you want to practice drawing parallels and perpendiculars and you forgot how to do it?
Watch this video!
And now… some good works 🙂
The objective of this exercise is to learn how to use the compass and the set square. We also listened some celtic music to intruduce the work.