You are here

Inscribed circle and trapezoid

Author(s): 

Circle O(r) is inscribed in an isosceles trapezoid ABCD, where AB is parallel to CD and AD = BC.  Show that 4r2 = (AB)(CD).  (Japan, Edo Period, 1603-1867)

 

"Inscribed circle and trapezoid," Loci (March 2006)

Dummy View - NOT TO BE DELETED