There is nothing wrong with that sentence.
There are many shaped buttons, like triangles and hearts. Most are round, because it is the easiest shape to fit in the hole! :)
Shirt buttons are round because it makes it easier to get through the loop or the hole on the shirt, instead of having some other designs.
On an accordian, the piano-key-like buttons play individual notes, to play the melody, and the little round buttons play chords.
In the sentence given, "round" is a noun.
The adjective for this sentence is round.
"The ball is round"
a good sentence would be my dog went round and round in circles before his nap
In the sentence "circles are round," the word "round" is an adjective describing the shape of the circles.
On pages 14 and 15 of the Spy Year Round Challenger book, the four buttons are located on the bottom right corner. Look for the buttons labeled with icons or arrows to navigate through the pages or access additional features.
I rolled the ball in a perfect round around the table.
Buttons r nice and round but i would not recommend eating them before a raquetball game b/c they taste bad and can kill u
Not year round but for the better part of the year.