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193, 194
194-196

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200-203

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Directed lengths, angles, and areas

294, 295. Algebraical representation of these

296–299. Dependent signs. Signs in Multiplication

§ 2. Application to Trigonometrical Ratios.

Extended definition of ratios

Convention as to sign

307-314. Comparison of ratios of related angles
315-319. Changes in sign and value of ratios.

216-220
220, 221
222-224

224, 225

225-229

229-235

235-238

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245, 246.

246-250
251-253

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