<P> Measured at the stylobate , the dimensions of the base of the Parthenon are 69.5 by 30.9 metres ( 228 by 101 ft ) . The cella was 29.8 metres long by 19.2 metres wide ( 97.8 × 63.0 ft ) . On the exterior , the Doric columns measure 1.9 metres ( 6.2 ft ) in diameter and are 10.4 metres ( 34 ft ) high . The corner columns are slightly larger in diameter . The Parthenon had 46 outer columns and 23 inner columns in total , each column containing 20 flutes . ( A flute is the concave shaft carved into the column form . ) The roof was covered with large overlapping marble tiles known as imbrices and tegulae . </P>
what was the roof of the parthenon made of
large overlapping marble tiles known as imbrices and tegulae