2. Look at the wrong questions before.

3. Review the answering skills and attention points emphasized by the teacher.

4. Remembering common conclusions and problem-solving patterns can improve your ability to think and solve problems.

A right triangle commonly used in a circle: 1), with a diameter of 90 and a right triangle; 2) The triangle where the tangent line is located; 3) Half of the chord, the chord center distance and radius form a right triangle.

The height on the hypotenuse of a right triangle, the similarity conclusion between two small right triangles and the projective theorem are obtained.

The relationship between the angles of a special right triangle, the midline of the hypotenuse is equal to half of the hypotenuse, and the relationship between the linear function k and the angle.

Eight common methods of establishing angle relation;

1, sum of inner angle and outer angle

2. Complement each other.

3. Angle dividing line

4. Parallel (centerline)

5. Equivalent substitution (the included angle between the center line of the hypotenuse of a right triangle and the bisectors of the inner and outer angles of the triangle)

6. Consistent similarity

7. The central angle and circumferential angle of the arc in the circle.

8. Algebraic expressions

5. Pay attention to the reasonable allocation of examination time during the examination and get as many points as possible.