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10 cards from this deck
Thales' theorem
90°90°90° (right angle)
90°90°90°
OA=OB=OC=rOA = OB = OC = rOA=OB=OC=r
180°180°180°
∠AOC=2∠ACB\angle AOC = 2\angle ACB∠AOC=2∠ACB
Right triangle
62+82=1026^2+8^2=10^262+82=102 ✓
Angle subtended by diameter = 90°90°90°
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