Simson's line

Author:Terry Tam

P is a point on a circle, and ABC is an inscribed triangle. Prove that the feets of altitudes of point P on 3 sides of the triangle are collinear. (Hint: Consider PABC as a cyclic quadrilateral)

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Proving Triangles Similar: Multistep Transformations
bewijs stelling van Pythagoras
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نمونه تابع نه صعودی و نه نزولی
Voronoi Plaything
Ejemplo
TO FIND THE CENTRE OF A CIRCLE
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Ratios
Parallelogram
Perimeter
Straight Lines
Incircle or Inscribed Circle