What Is The Total Area Of The Red Spots? Can You Solve This Geometry Problem From China?

The diagram involves a rectangle with dimensions of 10 and 20. Inside the rectangle one of its diagonals is connected. There are two circles of equal size that are tangent to each other and the rectangle.

The video presents the solution to one version of the problem and then the solution to a second, much harder version.

See if you can find the total area of the red spots.

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