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3. The Length Arc and Area of Sector

An arc is a curved line that is part of the circumference of a circle, so to
determine the length of the arc of a circle, a comparison with the circumference
of the circle is used.

Pay attention to the pictures. If the center angle of the arc AC is AOC, and the
angle at the center of the circle is 360° , then there will be an equivalent ratio,
namely:

=

Pattern :

Length arc AC = circumference circle x

Area of Sector AOB = x Area of Sector

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