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Azimuthal semicircle in Taqī al-Dīn's description of his instruments & observatory in Istanbul, 1570-90 @GallicaBnF https://t.co/NbDUyVpsJ5
#Geometry Problem 333 #Circle #semicircle #Perpendicular common #tangent #teacher
Details: https://t.co/BC6cL0nPGd
#Geometry Problem 311: #Circle Inscribed in a #Semicircle, #Chord, #Diameter #math
Details: https://t.co/HN5M9a1UA8
#Geometry Problem 310: #Circle Inscribed in a #Semicircle, 45 Degrees #Angle #math
Details: https://t.co/r68BDepEQb
Franko B (semicircle) oil close ups @ZeitgeistAP @inkdgallery @TaniaWade @GFEST @g_montoriol @axisweb @paintbritain