Equation of altitudes and perpendicular bisectors Now use the information you already have about finding the equation of a line and apply it to the dashed lines shown in these triangles.

The perpendicular distance between the side labelled with a question mark and the opposite vertex has been drawn, outside the shape, with dashed lines and labelled as eight metres.

Allan Berele, Stefan Catoiu, Area and Perimeter Bisecting Lines of a Triangle, The College Mathematics Journal, Vol. 47, No. 1 (January 2016), pp. 19-28 ...