How large is the shaded area? Could you get it? Let't try!

Solving problems with triangles in 7th, 8th and 9th grades is a good training of our brain. Geometry learning requires both visualization of the pictures, building logical constructions, using algebra. That's why it's interesting to work with geometrical problems.
You could first try to solve this problem by yourself, and then you may see our answer.
Wish you success in your studies!
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