Here, BC≠6 units OD is perpendicular to BC. BD‌=3‌ units ‌ OD‌=4‌ units ‌ OB‌=√(OD)2+(BD)2 ‌=√32+42 ‌=5‌ units ‌ ∴ Radius 5 units Coordinate of the centre is (±5,4). Equation of circle (x±5)2+(y−4)2=52 ‌⇒x2+y2±10x−8y+25+16−25=0 ‌⇒x2+y2±10x−8y+16=0