A builder makes drainpipes that drop 1 cm over a horizontal distance of 30 cm to prevent clogs

Determine the relationship of ab and cd given the following points

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.