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Confident teacher of geometry pointing at drawing of triangle on blackboard
Triangle ABD right-angled at A showing C on BD, C,D angles equal proving AC equals AD
Point D lying off perpendicular bisector at x=4 cm, 18 cm from C, AB8 BC16 AC24cm
Inequality proof presenting Cauchy-Schwarz derivation on white background with algebraic steps
Pythagoras the Samian at Pythagorion Port view Samos Island is populer tourist destination in Greece