The memorial has a large wall shaped in a half-circle.

VOA: special.2009.05.25

So that a half circle, instead of calling it 180 degrees, And a quarter circle, instead of 90, It's good to know certain famous angles.

半圆,不说它是180°,四分之一圆,不叫90°,知道一些常用的角度很有必要

耶鲁公开课 - 基础物理课程节选

It formed a half-circle shape of a bowl.

VOA: special.2010.01.04