Geometric Construction 10



Illustrate Pascal's Mystic Hexagram Theorem for a Circle: The points 12, 23, 31 of the intersection of the three pairs of opposite sides 1'2 and 12', 2'3 and 23', 3'1 and 13' of a hexagon 12'31'23' inscribed in a circle lie on a line.

Construct the conic passing through five given points.
 




Construct the conic passing through four given points and tangent to a given line which contains exactly one of the points.







Given three points and two lines each containing exactly one of the points, construct the conic passing through the three points and tangent to the lines at the given points.


Illustrate Brianchon's Theorem for a Circle: If a hexagon is circumscribed about a circle, the three joining pairs of opposite vertices are concurrent.

Investigate this special case of Brianchon's Theorem:

Investigate this special case of Brianchon's Theorem:

Investigate this special case of Brianchon's Theorem:

Construct the conic tangent to five given lines.

Construct the conic tangent to four given lines and passes through a point on one of them.

Construct the conic tangent to three given lines and passes through two points on two of them.