T1R1I1H4E1D2R1A1
12 points
TRIHEDRA is validvalid
TRIHEDRON, a figure having three plane surfaces meeting at a point [n]
TRIHEDRON, a solid figure with three plane surfaces meeting at a point [n]
TRIHEDRON, a figure having three plane surfaces meeting at a point [n]
TRIHEDRON, a solid figure with three plane surfaces meeting at a point [n]