Detailed description
Right-angled triangle ABD. Right angle at D. A(x1, y1), B(x2, y2), D(x3, y3). P(x, y) is a point on AB with AP = k and PB = 1. Line segment PC is drawn perpendicular to AD with C(x, y1) on AD.
Coordinate geometry
Right-angled triangle ABD. Right angle at D. A(x1, y1), B(x2, y2), D(x3, y3). P(x, y) is a point on AB with AP = k and PB = 1. Line segment PC is drawn perpendicular to AD with C(x, y1) on AD.