A System of Geometry and Trigonometry: Together with a Treatise on Surveying, Teaching Various Ways of Taking the Survey of a Field, Also to Protract the Same and Find the Area, Likewise Rectangular Surveying, Or an Accurate Method of Calculating the Area

Excerpt from A System of Geometry and Trigonometry: Together With a Treatise on Surveying, Teaching Various Ways of Taking the Survey of a Field, Also to Protract the Same and Find the Area, Likewise Rectangular Surveying, or an Accurate Method of Calculating the Area of Any Field Arithmetically

Note. The three Angles of every Triangle being added together will amount to 180 Degrees con sequently the two Acute Angles of a Right Angled Triangle amount to 90 Degrees, the Right Angle being also 90.

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