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...Circle notes for ssc cgl and chsl sector l length of arc ab r radius always in radian ic c i area oab perimeter segment oacb rsin acb chord www bankersadda com sscadda careerpower adda q find the a with central angle degrees cm sol an subtends at centre is important properties perpendicular from to bisects am mb cd are two parallel chords on same side center distance between them let x ao triangle aoe ocn corresponding equal arcs if then angles equidistance ox oy subtended by double it any point remaining part y which this major oa ob therefore equilateral semicircle right ac diameter circumcircle abc ed cbe measure dec...