How to draw corners with protractor in mathematics in the fourth grade of primary school - Training Enrollment Network

How to draw corners with protractor in mathematics in the fourth grade of primary school

The fourth grade of primary school.

I can't remember what happened so long ago. But there are two kinds of triangles, one is 45, and the other is 30 and 60.

The angles of 45 and 60 add up to 105. Then measure both sides of the waist and connect the bottom.

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