Answer :
I believe the correct answer is: in semicircle.
Nanni d'Antonio di Banco was a sculptor from Florence, Italy, whose significance lays in naturalism and individuality of the figures in his artworks, but also the complexity of construction of a sculptures which represent a group. He achieved unified spatial composition by placing the figures in the semicircle and in relation to one another, such as sculpture “Quattro Santi Coronati”.