A scriptorium is commonly a large room set apart in a monastery for the use of the scribes or copyists of the community.When no special room was devoted to this purpose, separate little cells or studies called carrels were usually made in the cloister, each scribe having a window and desk to himself.he rules of the scriptorium varied in different monasteries, but artificial light was forbidden for fear of injury to the manuscripts, and silence was always enforced. As a general rule those of the monks who possessed skill as writers made this their chief, if not their sole active work.
Another quadrilateral that you might see is called a rhombus. All four sides of a rhombus are congruent. Its properties include that each pair of opposite sides is parallel, also making it a parallelogram. In summary, all squares are rectangles, but not all rectangles are squares.
2. If both pairs of opposite sides of a quadrilateral are congruent, then it is a parallelogram. 3. If one pair of opposite sides of a quadrilateral are both parallel and congruent, then it is a parallelogram. 4. If the diagonals of a quadrilateral bisect each other, then the it is a parallelogram. 5.. If both pairs of opposite angles of a quadrilateral are congruent, then it is a parallelogram. Proving That a Quadrilateral is a Rectangle One can prove that a quadrilateral is a rectangle by first showing that it is a parallelogram and then using either of the following methods to complete the proof.