A train on Hanoi Metro Line 2A glides above Hoang Cau Lake at sunset. The city’s next project, the $1.3-billion Line 2, will extend the network through the Old Quarter toward Tran Hung Dao Station.
Pythagoras' theorem close Pythagoras' theoremPythagoras's theorem applies to right-angled triangles. The area of the square drawn on the hypotenuse is equal to the sum of the squares drawn on the ...
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