The same channel

Two circles and two common tangents. Prove that the blue triangle is isosceles.

Scroll down for a solution to this problem.


Solution by Kamran Zamani.


The same channel
connects the two banks
The trapped water flows to the sea
The channel bed
Proudly keeps the water
Like a cristal
Slowly the quays are passing by
Sometimes in the countryside
Sometimes in town
The barges slip
On the deep channel
Finally a sign,
The holidays


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