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In a circle, a central angle is formed by two radii. By definition, the measure of the intercepted arc is equal to the central angle.
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A part of a circle enclosed by two radii is called a sector.
A circular sector is formed by two radii and an arc. And the angle formed due to the two radii is central angle(Θ). Area of a sector = (Θ/360) πr2.If we divide a circle into seven sectors having equal central angles then the circle is divided into seven equal parts.Angle of the whole circle is 360o. So we should divide the whole angle into 7 equal parts each measuring 360o/7 and then forming the corresponding sectors.