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Cut-the-Knot Action 15!
Author:
Tim Brzezinski
Topic:
Circumcircle or Circumscribed Circle
,
Incircle or Inscribed Circle
Creation of this applet was inspired by a
tweet
from
Alexander Bogomolny
.
How can we formally prove THIS to be true?
GeoGebra
Quick (Silent) Demo
New Resources
Angles and Intersecting Lines: Quick Investigation
Stairs (Optical Illusion)
Ellipse, Hyperbola and Circle as Envelopes
"Compressed" Astroid as Envelope
Drag that Point!
Discover Resources
numeric-bug
Transformations on quadratic function in standard form
รูปสามเหลี่ยมคล้าย
Geometric Probability - Question Posing
Roots of Quadratic Functions
Discover Topics
Distributions
Polygons
Isosceles Triangles
Translation
Exponent