A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 123
P withthe centre O, and upon PO as a diameter describe a circle. Let T and T be the intersections of the two cir-cumferences. Now, if lines bedrawn from P through T and T,they will be tangent to the circle O. For OTP and OTP,being inscribed in semi-circles,are right angles {211). Hence,PM is… … Fig. 165. 4. I^rob,—On a given Ji?ie, to constiuct a segment ichich shall contain a given angle. SoLUTiox. — Let AB bethe given line, and O thegiven angle. At one ex-tremity of the given line, asB, construct an angle ABCequal to the given angle O,which shall lie on the oppo-site of AB from that on…
Geometry · Trigonometry
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