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István Lénárt
Lénárt sphere
A
Lénárt sphere
is an educational
manipulative
and
writing surface
for exploring
spherical geometry
, invented by
Hungarian
István Lénárt as a modern replacement for a spherical
blackboard
. It can be used for visualizing the geometry of
point
s,
great and small circles
,
triangle
s,
polygon
s,
conic
s, and other objects on a
sphere
, and comparing spherical geometry to
Euclidean geometry
as drawn on a flat piece of paper or blackboard. The included spherical
ruler
and
compass
support
synthetic
straightedge and compass construction
on the sphere.
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István Lénárt
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The man from London
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