练习（点，斜率，直线）
Novos Materiais
Descobrir recursos
- PointOnConic02
- Mediatriz
- Circle Tangent to Sides of an angle (3.8 #7)
- distribuzione binomiale
- Mosaic: Escher's Lizard
- Perpendicular Bisectors
- Construct the Orthocenter of the given triangle. Construct the 3 altitudes in the given triangle and find the point where all 3 altitudes intersect. Leave all construction marks. (Connect C w