El diámetro de un círculo es d y su perímetro es p. ¿Cómo se expresa la constante π en términos de p y d? Seleccione una:
a. π = p ∙ 2d
b. π =p2d

c. π = pd

d. π =pd2

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.