# GoGeometry Action 148!

- Author:
- Tim Brzezinski

- Topic:
- Geometry

Creation of this resource was inspired by a tweet from Antonio Gutierrez (GoGeometry).
Both circles you see are externally tangent to each other.
In addition, both lines you see are externally tangent to both circles.
Note:
The

**LARGE POINTS**are**MOVEABLE**.Now, here's another question:
We now know that the areas of both

**manila triangles**(shown below) are equal. Yet how can we prove that the area of the**green quadrilateral**= double the area of one of these triangles?