A polyhedron is formed by cutting off a corner of a triangular pyramid. Among the faces of this polyhedron, several are trapezoids. The sum of the areas of these trapezoids is A. 10 B. 12 C. 14 D. 16
A polyhedron is formed by cutting off a corner of a triangular pyramid. Among the faces of this polyhedron, several are trapezoids. The sum of the areas of these trapezoids is
A. 10
B. 12
C. 14
D. 16