'Circumference' in the Bible

He cast two hollow bronze pillars: each 27 feet high and 18 feet in circumference.

He made the cast metal reservoir, 15 feet from brim to brim, perfectly round. It was 7½ feet high and 45 feet in circumference.

Then he made the cast metal reservoir, 15 feet from brim to brim, perfectly round. It was 7½ feet high and 45 feet in circumference.

One pillar was 27 feet tall, had a circumference of 18 feet, was hollow—four fingers thick—