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<h2>4</h2>Step-by-step explanation:
<em>Look at the picture.</em>
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<em>At the beginning we have to calculate what part of the angle 360° is the given angle 75°.</em>
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<em>The same part of the circumference of the circle is the arc defined by this central angle.</em>
The circumference <em>C = 20</em>.
Therefore
