Arrow geometry theorem, an useful theorem

AM-GM Inequality proof with Geometry

Sum of internal angles of a triangle. Is it always 180?

Arrow geometry theorem, an useful theorem

Tangents to a circle from an external point.

Cosines chain

Transformer Triangle turns into a square

Encuentra el radio... Parece un problema inocente, pero...

The 3 squares problem, a brilliant solution

The easy geometry hardest problem in the world

The tangent circles problem

¡Un problema de olimpiada que no podrás resolver!

¡Ahora es cuándo, ley de cosenos!