There are several multiplication formulas of 1, and their final number is exactly a few.

2, a few plus a few is a few times.

3. An angle consists of two sides of the vertex.

4. judge the angle; The vertex of an angle is sharp, and both sides of the angle are straight. If it is not pointed or straight, it is not an angle.

5. A small corner is really simple, and a vertex has two sides. Remember to draw the vertex before drawing the edge when drawing the corner.

6. The angle has nothing to do with the length of the side, but with the angle.

7, acute angle > 9. Right angle = 9. Obtuse angle > 9. acute angle