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Academy News, Answers to the Mathematical World, Grade 7.
2ê3ê3ê Sorry, it won't be 4ê3. 14 5ê54ê6ê Connect the bottom of the triangle, that is, connect BD, and then measure the degrees of B and D angles, and subtract 180 degrees to know whether the degrees of the two canals are 45 ê.

I wonder if I can help you.