The pyramid is 6.9 metres ( 23 ft ) high .
The pyramid measures 15.4 by 7.25 metres ( 50.5 by 23.8 ft ) at the base .
The pyramid is 6.9 metres ( 23 ft ) high and measures 15.4 by 7.25 metres ( 50.5 by 23.8 ft ) at the base .