SubArea: Metric propertiesLevel: CProject ID: 1103107001Accepted: 1Clonable: 0Easy: 0Let ABCDEFA′B′C′D′E′F′ be a regular hexagonal prism with the base edge length of 4cm and the height of 8cm. Find the angle between the lines FC′ and CF′ (see the picture).90∘45∘60∘72∘