Arc length and sector areaHSG.C.B.5Find the length of an arc and the area of a sector from the radius and the central angle, and find the central angle from an arc length.Inscribed and central anglesHSG.C.A.2Use the facts that a central angle equals its arc and an inscribed angle is half its arc to find angles, arcs and x.Equation of a circleHSG.GPE.A.1Write the equation of a circle from its center and radius, read the center and radius from standard form, and complete the square to find them from general form.Segments of chords, secants and tangentsHSG.C.A.2Use the intersecting chords theorem and the tangent-secant theorem to find missing segment lengths in circles.