6. (The curvi-linear area may be) a circle, a semicircle, an ellipse, a conchiform area, a concave circular area, a convex circular area, an out-lying annulus or an in-reaching annulus.
|Kambukāvṛtta = conchiform area.
||Nimmavṛtta = concave circular area.
||Unnaiavṛtta = convex circular area.|
|Bahiścakravālavṛtta = Out-lying annulus.||Antaścakravālavṛita = In-reaching annulus|
From a consideration of the rules given for the measurement of the dimensions and areas of quadrilateral figures, it has to be concluded that all the quadrilateral figures mentioned in this chapter are cyclic. Hence an equilateral quadrilateral is a square, an equidichastic quadrilateral is an oblong; and equiilateral and equi-trilateral quadrilaterals have their topside parallel to the base