Definitions of some Properties of a Circle

• An arc of a circle is a connected section of the circumference of a circle. There's both a minor (shorter) and major (larger) arc. We'll let s stand for the length of the arc.
• A sector of a circle is the part of the interior of a circle bounded by two radii and an arc. There's both a minor (shorter) and major (larger) sector. We'll let a stand for the area of the sector.
• The central or sector angle of a circle is the angle formed by two radii. There's both a minor (shorter) and major (larger) sector angle. We'll let theta stand for the sector angle.
• Important Proportion,