

The altitudes of a parallelogram ABCD where AD=a, AB=b, and angle BAD=θ



The altitudes of parallelogram ABCD where vertex A has coordinates (x[0],y[0]), vertex B has coordinates (x[1],y[1]), and vertex C has coordinates (x[...



The altitudes of a parallelogram ABCD where the equations of lines AB, BC, CD, and DA are known



