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The Buntun bridge spans the Cagayan River. It is 1,369 m long and said to be the longest river bridge in the country. It was opened in 1947 and has been known as the gateway to the City of Tuguegarao.
The bridge has never been flooded by the river but it almost did when typhoons Ondoy and Juan hit the city.
One of the reasons why it still stands magnificently until today because of its structures that are made of congruent triangles.
In the figure at the right, it is given that ED = RB and ED// RB.
Prove that ARED = ADBR by completing the two-column proof below.
