How to distinguish the inner and outer lines of the angle in the fourth grade mathematics of primary school

The first step is to find the vertex of the angle. Align the origin of the protractor with the vertex of the angle.

Step 2, align the 0-degree edge of the protractor with the corner edge.

The third step is to find the value corresponding to the other side of the angle, which is the degree of the angle. (When reading, pay attention to whether the 0 side is outside or inside. Read the number of laps outside and read the number of laps inside. )

400 words in the fourth grade math thesis.

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