quack, quadrangle, quadrant, quadrilateral

I was sitting in a lovely quadrangle,
Watching a juggler sing Bo Jangle.

Under a large shady chestnut tree,
He danced in the quadrilateral so merrily.

The park was divided into 4 quadrants;
a pond, a stage, cafes and spewing hydrants.

Children played under the cool water spray,
While ducks quacked their songs in the hot summer day.
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As soon as you trust yourself, you will know how to live.
Goethe