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Why only need to mark right-angle symbols in second-grade mathematics?
The right angle is 90 degrees. As long as you mark the right angle symbol because the right angle is 90 degrees, you can know the degree by marking the right angle symbol. The right-angle symbol is a symbol used to represent an angle of 90 degrees in geometry. In geometry and trigonometry, right angles are also called positive angles, which are 90 degrees.