Use Herons formula to determine the area of a triangle when you are gicven the lengths of the sides.
Drag the vertex of the triangle to create a new triangle to test.
What three side lengths did your triangle end up with?
Did your calculated area match the area shown in the simulation? If not, where do you think the mistake[br]happened?
Drag the vertices to try to make the biggest area you can while keeping the perimeter the same. What shape of triangle gave you the biggest area?