Quarter-circle used in a sentence

Quarter-circle in a sentence as a noun

There were dogs on the beach held back by their owners, sweeping flat quarter-circles in the sand with their tails.

So, from horse 1's frame of reference, horse 2 indeed did orbit it once!Now imagine the horses on a modified track that instead of two straightaways and two half-circle turns has four straightaways and four quarter-circle turns.