Orthocentre එකේ මෙහෙම සීන් එකක් තියෙනව නේද

AnuradhaRa

Well-known member
  • මම ඉතිං හිමින් හිමින් කල්පනා කරගෙන කරගෙන ගියා.. :P මොකද මම ඊයෙ ගාණ හදපු හැටි වැරදිද දන්නෙ නෑනෙ..
    @imhotep

    චතුස්තලයක් හැදුවම ඒකෙ මුදුණ එන්නෙ හරියටම Orthocentre එකට

    චතුස්තලය = Tetrahedron පතුල ත්‍රිකෝණයක්

    පතුල සමචතුරස්‍රයක් නම් අපි පිරමිඩ් එකක් කියල කියනව


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    imhotep

    Well-known member
  • Mar 29, 2017
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    I am not a mathematician... I know that every traingle has an orthocentre as the three perpendicuars to the opposite sides always meet at a point.

    I am not so sure about a tetrahedron. There's somthing called the Monge point. The six planes through the midpoints of the edges of a tetrahedron and perpendicular to the opposite edges concur in a point known as the Monge point.
    (The same Monge who showed that for any three circles in a plane, none of which is completely inside one of the others, the intersection points of each of the three pairs of external tangent lines are collinear. - Monge's Theorem)

    The Monge point and the orthocentre of a Tetrahedron is the same I believe provided the orthocentre exists. This only happens for orthocentric tetrahedrons. For a tetrahedron to be orthocentric, the four lines drawn from each vertex perpendicular to the face opposite that vertex should meet at one point which is the orthocentre.

    Maybe someone who is a mathematician can provide more details.