- Manipulate the triangle by dragging the vertices.
- Optionally lock any side or angle to its current size.
- Various constructions can be added for guidance:
- The circumcircle,
- A circle on any vertex of radius equal to the length of either connected side,
- Any side extended in both directions.

- Any visible constructions will dynamically update as the triangle is changed, unless explicitly locked.
- Use the
*Overrides*options to apply a particular transformation.

- Simultaneously display a free triangle and a constrained triangle.
- Apply constraints and manipulate the second triangle, then compare both triangles to see the effects.
- Return the constrained triangle to the same state
as the unconstrained one at any time using the
*Revert*button. - Hit the
*Compare*button to compare the triangles directly.