Fill in the blank in the following sentence with the appropriate verb below.
hablar en la biblioteca.
o a es necesario
o b. se debe
o c. se prohíbe
o d. hay que

In the diagram, which must be true for point d to be anorthocenter? o be, cf, and ag are angle bisectors.be 1 ac, ag 1 bc, and cf 1 ab.be bisects ac, cf bisects ab, and ag bisects bc.be is a perpendicular bisector of ac, cf is aperpendicular bisector of ab, and ag is a perpendicularbisector of bc.