1, point, line, surface and angle:

The vertex angles are equal; Definition of angular bisector; Right angles are equal; The complementary angles of the same angle or equal angle are equal; The complementary angles of the same angle or equal angle are equal; The midpoint definition of a line segment.

2. Parallel lines:

The two straight lines are parallel, and the isosceles angle and the internal dislocation angle are equal; The distance between parallel lines is equal everywhere; The parallel segments sandwiched between two parallel lines are equal;

3. Triangle:

Equiangular and equilateral; Equilateral and angular; The corresponding angles of congruent triangles are equal, the corresponding sides are equal, and the median line, height and bisector of the corresponding angle on the corresponding side are equal.

4, quadrilateral:

Parallelogram has equal opposite sides and diagonal angles; Diagonal bisection; The four corners of a rectangle are equal and are right angles; The diagonal of the rectangle is divided into two and equal to each other; The four sides of the diamond are equal; The rhombic diagonal bisects each diagonal group; The four sides of a square are equal, the four corners are equal, the diagonal lines are equally divided, and each diagonal line is equally divided; The two angles of the isosceles trapezoid on the same base are equal; The two diagonals of an isosceles trapezoid are equal, and the distance from the intersection of the diagonals to both ends of the same base is equal.

5, important theorem:

The distance from any point on the bisector of the angle to both sides of the angle is equal; Points with equal distances to both sides of the angle are on the bisector of the angle; The distance from any point on the vertical line in the line segment to both ends of the line segment is equal; The point where the distance between the two ends of a line segment is equal is on the middle vertical line of the line segment.

6. Circle:

Vertical diameter theorem, the diameter perpendicular to the chord bisects the chord and bisects the two arcs opposite to the chord; In the same circle or equal circle, the chords of the same arc or equal arc are equal, and the central angles of the arcs are equal; In the same circle or in the same circle, the central angle is equal and the chords are equal; In the same circle or equal circle, the circumferential angles of the same arc or equal arc are equal; The distance from the center of the triangle to the three sides of the triangle is equal; The distance from the outer center of the triangle to the three vertices of the triangle is equal; Chord tangent angle theorem; Tangent length theorem and so on

I can't remember anything else at the moment!

It's just that I'm reviewing in senior three now, hehe! But there may be some differences between the theorems in the local department and those in the textbook!

I hope I can help you!

At least I typed so many words, recommended!