the distance around a circular region is called circumference
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The area bounded by an arc of circle and two radii is known as a "circular sector"
154 cm2
Unfortunately, not all clocks are circular. The reason that most clocks are circular is because of convenience. As clocks rely on the rotation of the hands to tell time, it is simply easier for the numbers to be arranged in a circular formation around it.
The line connecting the points is called a chord; the part of the perimeter of the circle enclosed is called an arc; the area between an arc and the chord is called a circular segment.