Centres of a triangle
Centres of a triangle is an interactive experiment in Plane Geometry, a free simulation from StudyFi Lab that runs right in your browser.
The altitudes meet at the orthocentre H, the medians at the centroid T, the perpendicular bisectors at the circumcentre O (centre of the circumscribed circle) and the angle bisectors at the incentre I (centre of the inscribed circle). H, T and O always lie on one line — the Euler line.
Try this: Switch the lines on one by one and drag a vertex — watch where each centre goes, e.g. outside an obtuse triangle.
Frequently asked questions
What does the “Centres of a triangle” experiment show?
The altitudes meet at the orthocentre H, the medians at the centroid T, the perpendicular bisectors at the circumcentre O (centre of the circumscribed circle) and the angle bisectors at the incentre I (centre of the inscribed circle). H, T and O always lie on one line — the Euler line.
How do I try “Centres of a triangle”?
Switch the lines on one by one and drag a vertex — watch where each centre goes, e.g. outside an obtuse triangle.
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