III.
Equation of a shape
III-1.
Plane coordinates
Lesson 1: Distance between two points
Lesson 2: Internal and external divisions on a vertical line
Lecture 03: Internal and external division in the coordinate plane (feat.
Center of gravity)
III-2.
Equation of a straight line
Lesson 4: Equation of a Line (given one point, slope, and two points)
Lesson 5: Positional Relationships Between Two Straight Lines
Lesson 6: Distance between a point and a line
III-3.
Equation of a circle
Lecture 7: Equations of Circles (Standard and Basic Forms)
Lesson 8: Positional Relationships Between Circles and Lines
Lesson 9: Equation of a tangent to a circle
III-4.
Movement of shapes
Lesson 10: Parallel Movement
Lesson 11: Application of Parallel Translation of Shapes
Lesson 12: Symmetrical Movement (1)
Lesson 13: Symmetrical Movement (2)

IV.
Sets and Propositions
IV-1.
set
Lesson 14: Meaning and Expression of Sets
Lecture 15: Inclusion Relations of Sets
Number of subsets in the 16th round
Lesson 17: Set Operations
18. Properties of operations on sets
Lesson 19: Set Operation Laws
Number of elements in a set of 20
IV-2.
proposition
Lesson 21: Propositions and Conditions
True and false in Lesson 22
Lesson 23: Propositions containing 'all' or 'some'
The converse and contrapositive of the 24th proposition
Lesson 25: Sufficient and Necessary Conditions
Lesson 26: The Law of Reductio ad absurdum
Lesson 27: Absolute Inequalities