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B&Q Limited (short for Block & Quayle after the company's two founders) is a British multinational DIY, home improvement and garden centre retailing company, with headquarters in Eastleigh, England. It is a wholly owned subsidiary of Kingfisher plc .
In Euclidean plane geometry, a tangent line to a circle is a line that touches the circle at exactly one point, never entering the circle's interior.Tangent lines to circles form the subject of several theorems, and play an important role in many geometrical constructions and proofs.
Quaternions were introduced by Hamilton in 1843. [9] Important precursors to this work included Euler's four-square identity (1748) and Olinde Rodrigues' parameterization of general rotations by four parameters (1840), but neither of these writers treated the four-parameter rotations as an algebra.