# The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art

E. Duyckinck, 1811 - 508 sider

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Side 46 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Side 33 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Side 209 - RULE. From half the sum of the three sides subtract each side severally.
Side 8 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Side 114 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Side 8 - ... then multiply the second and third terms together, and divide the product by the first term, and the quotient will be the answer ; — in the same denomination with the third term.
Side 35 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.