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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.