Question

an arc is a_ when it's ends are ends of a diameter
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Answer 1

Answer:

$\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}\red{:}\pink{—}}}} \\ Chord$

when its ends of diameter meet each other

Answer 2

an arc is a semicircle when it's ends are ends of a diameter