Common geometry formulas you can use to calculate the area, perimeter, and circumference of various plane figures.
Formula sheet - Geometry
Circle Theorems – Maths Poster
Formula sheet - dont plan on teaching this stuff but it could be useful…
Middle School Math Man: Angles, Triangles, and the Start of Geometry in 6th Grade Math!
EEWeb's Math Reference Sheets are FREE - and wonderful collections of formulas in Algebra, Geometry, Calculus, Trig, & more!
Is Geometric Algebra isomorphic to Tensor Algebra? - Mathematics Stack Exchange
Love this for practicing alternate, co-interior, vertically opposite and corresponding angles.
Pythagoras' Theorem Poster