Circumference
and Area

Ellipse (approx) 
Sector
of an Annulus 
Sector
and Segment 
Parabolic
Segment K (right segment) K (oblique segment) , where T is the area of the triangle with the base along the chord of the segment and with opposite vertex at the point on the parabola at which the tangent to the parabola is parallel to the chord of the segment. 