These are resources provided by EDB, available in the GeoGebraTube.

## Make a Circumcircle

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?

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?

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*Drag the three vertices of the triangle to change its shape.*)## Inscribe a Circle in a Triangle

How to draw a circle in a triangle which touches its three sides? Explore with the following worksheet.

GeoGebra 4.2 provides new freehand shape tool for another means of sketching and comparing position of circles partially circumscribing a triangle.

Try your drawing here.