Drawing a Circle passes through the 3 Vertices of a Triangle

Key Stage 3 (Junior Secondary)‎ > ‎3.2 Measures, Shape & Space 度量、圖形與空間‎ > ‎Simple Introduction to Deductive Geometry 演繹幾何簡介‎ > ‎

Drawing a Circle passes through the 3 Vertices of a Triangle

Drag the blue point to A.
Drag the centre (the red point) to different positions at which the circle also passes through B.
Observe the marks of these positions. What are their characteristic?

What is the charateristic of the positions of the centre at which the circle passes through A and C?

How to draw the circle which passes thorough A, B and C?

http://www.geogebratube.org/material/show/id/3958 (Download GeoGebra file)

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