Move point B on the triangle to change the triangle's sides lengths. Move points D and E on segments they are on to adjust the transversal. The equation AD/DB x BE/EC x CF/AF=1 shows that the points D, E, and F are collinear. The check boxes all show different parts about the line and how it interacts with Triangle. Click them to find out more about the theorem.
Do you think that the ratios of AD/DB and j/m will be the same? Check the box to the right to see. Are their similar triangles in the picture? Check the box up top to see. To see the formula and check if points D, E, and F are collinear, check the box at the bottom left.