1, understand the definition of right triangle: a triangle with an angle equal to 90 degrees is called a right triangle.

2. Draw a right triangle on white paper.

3. Match the right angle edge of the triangular ruler board with the bottom edge of the high line to be drawn.

4. Right-angled edges intersect with fixed points.

5. Draw a line along the right angle of the triangle with a pencil, which is high.

6. The other two right angles of a right triangle are also high lines.

Advantages of learning mathematics

1, to meet the needs of people's daily life, work, counting, calculation and reasoning. In people's daily life and work, it is essential to count things, calculate various quantities and compare related quantities. Mathematical knowledge and thinking methods are needed here.

2. Exercise people's thinking level and thinking quality. Mathematical science is a rigorous and meticulous science, so while learning mathematical science knowledge, it also exercises people's thinking.

3. Mathematics learning can provide necessary technical support for further study of natural science and social science. Mathematics, as a basic subject to understand the world, can support the in-depth development of different applied sciences ideologically and technically.

4. Learning mathematics can help us understand and learn the scientific and rigorous scientific attitude and style embodied in mathematicians, and improve our scientific literacy.