I’ve written a number of posts the last couple of months which I published in other sites. They are problem solving tasks mostly in geometry using GeoGebra and a few on function, trigonometry and calculus. May I share 10 of them here. The first six are teaching resources which I posted in AgIMat, a site about science and math teaching resources. The last four problems are in Math Problems for K-12 to help students in their revision. Both sites are new ones. I hope you subscribe and promote them in your social networks. Thank you.

- Problem solving on congruent segments
- Square and triangle problem
- Triangle Congruence by ASA
- Angle bisector – two definitions
- Constructing the perpendicular bisector
- Exponential function and its inverse
- How to sketch the graph of the derivative of a function
- Ratio and probability problem
- Trigonometric equations and their graphs
- Proving trigonometric identities #1