Triangle Calculator

The triangle

ABC

is limited to lattice points in the range

[-9,9]

. Drag the points

A

,

B

, and

C

to generate new triangles. Hover over lines and special points to get a popup with equations or values. The program calculates triangle centers:

• incenter

I

, the center of the incircle, where the angle bisectors intersect,

• centroid

G

, where the medians intersect,

• circumcenter

O

, the center of the circumcircle, where the perpendicular bisectors intersect, and

• orthocenter

H

, where the altitudes intersect.

The points

G

,

O

, and

H

are collinear.

Ed Pegg Jr