"Area and Arc Length of Circular Segment
'<hr /><div style="max-width:120mm;"><img style="height:60pt;" class="side" alt="segment-chord.png" src="https://calcpad.eu/media/math/area/segment-chord.png"></div>
'Dimensions
'Chord -'a = ?
'Height -'b = ?
'<!--
#if a ≥ 2*b
	'<-->
	'Radius
	r = b/2 + a^2/(8*b)
	'Angle
	α = 2*asin(a/(2*r))'&deg;
	'Area
	A = 0.5*(π*α/180 - sin(α))*r^2
	'Arc length
	S = π*r*α/180
	'<!--
#else
	'<-->
	'Chord <i>a</i> must be greater or equal to 2&middot;<i>b</i>
	'<!--
#end if
'<-->2	1