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First of all to correct your English grammar. Any noun, 'arc' in this case, that starts with a vowel , 'a' in this case, is preceded by the indefinite article 'an' , NOT 'a' .

So the question should read 'What is an arc of a circle?'

Answer: An arc is a section of the circumference , between two given points on the circumference.

Arc as given above.

Radius ; distance from circle centre to the circumference

Diameter ; Straight line distance from the circumfewrence, through the centre to the circumference on the opposite side.

Chord ; (Pronounced ; cord/kord). A straight line between any two points on the circumference, that does NOT touch the centre.

Sector ; The fraction of a circles area enclosed between two radii and the corresponding arc.

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lenpollock

Lvl 16
1mo ago

What else can I help you with?