| 21 | 20th LS(200608) Ch10.1 Lines and Segment(P533) | Jp Park  | 2020-06-08 | 1 |
| 22 | 21th LS(200610) Ch10.5 Angle Relations(P565) | Jp Park | 2020-06-10 | 2 |
| 23 | 22th LS(200612) Ch10.7 Circles in the Coordinate (P578) | Jp Park | 2020-06-12 | 2 |
| 24 | 23th LS(200615) Ch11.2 Areas of Circles(P608) | Jp Park | 2020-06-15 | 2 |
| 25 | 24th LS(200617) Ch11.7 Surface Areas of Cones(P644) | Jp Park | 2020-06-17 | 2 |
| 26 | 25th LS(200619) Ch12.2 Independent and Dependent(P677) | Jp Park | 2020-06-19 | 1 |
| 27 | 26th LS(200622) Ch12.4 Probability of disjoint and overlappi.. | Jp Park | 2020-06-22 | 1 |
| 28 | 27th LS(200624) Ch12.5 Permutation and Combination(P703) | Jp Park | 2020-06-24 | 1 |
| 29 | 28th LS(200626) Ch1 Linear Fuctions(P6) | Jp Park | 2020-06-26 | 1 |
| 30 | 29th LS(200629) Ch1 Linear Fuctions 복습(p6) | Jp Park | 2020-06-29 | 1 |
| 31 | 30th LS(200701) Ch1 Translation, Reflection, Dialation(p18) | Jp Park | 2020-07-01 | 1 |
| 32 | 31th LS(200703) Ch1.4 Solving Linear Systems(p36) | Jp Park | 2020-07-03 | 2 |
| 33 | 32th LS(200706) Ch2.1 Quadratic Function Transformation(p52.. | Jp Park | 2020-07-06 | 2 |
| 34 | 33th LS(200708) Ch2.2 Characteristic of Quadratic Function(p.. | Jp Park | 2020-07-08 | 2 |
| 35 | 34th LS(200710) Ch2.2 Characteristic of Quadratic Function(p.. | Jp Park | 2020-07-10 | 1 |
| 36 | 35th LS(200713) Ch2.2 Exercise(p63) | Jp Park | 2020-07-13 | 1 |
| 37 | 36th LS(200715) Ch2.4 Modeling with Quadratic Functions(p79) | Jp Park | 2020-07-15 | 1 |
| 38 | 37th LS(200717) Ch3.1 Solving Quadratic Equations(p101) | Jp Park | 2020-07-17 | 2 |
| 39 | 38th LS(200720) Ch3.3 Completing Square(p115) | Jp Park | 2020-07-20 | 1 |
| 40 | 39th LS(200722) Ch3.4 Quadratic Formula(p127) | Jp Park | 2020-07-22 | 0 |
