How could i express changes in this image in English?

expressions

enter image description here

Am i right in saying that it's both sides became circular?


Both ends are rounded. (Adjective)

1 : made round : flowing rather than jagged or angular

Both ends were rounded off. (Verb)

1 : to trim or finish into curved or rounded form

Circular would be understood but is more for when the entire piece becomes a circle, for example if you started with a square and made it a circle.

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