Final answer:
The electron-pair geometry for dimethyl ether is trigonal planar and the molecular structure is trigonal planar.
Step-by-step explanation:
The electron-pair geometry for dimethyl ether is trigonal planar and the molecular structure is trigonal planar. The carbon atoms in dimethyl ether are bonded to three other atoms, which gives them a trigonal planar electron-pair geometry. The molecular structure also remains trigonal planar because there are no lone pairs of electrons on either carbon atom.