This is possible for acute trapezoids or right trapezoids (rectangles). A parallelogram is a trapezoid with two pairs of parallel sides. A parallelogram has central 2-fold rotational symmetry (or point reflection symmetry). It is possible for obtuse trapezoids or right trapezoids (rectangles)
M = 0.01w So for a 10 pound dog, m = 0.01(10) = 0.1 mg Also, since 10 pounds is 1/5 of 50 pounds, then 1/5 of 0.5 mg is 0.1 mg. With either calculation, the dose is 0.1 mg