First Lessons in Geometry Upon the Model of Colburn's First Lessons in ArithmeticD. Appleton and Company, 1859 |
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AB² aBAC ABCD AC² adjacent angles altitude angle ABC angles equal angular points Arithmetic base and altitude BC² bend bisect breadth broken line centre contain curve describe arcs cutting diagonal diedral angles difference dimensions direction distance distinct straight lines divergence divided draw equal angles equiangular polygons equilateral exterior fall figure GEOM Geometry given angle greater hypotenuse identical triangles inches interior angles isosceles triangle Join lelogram length less Let AC line drawn magnitudes Mary Howitt multiplied oblique obtuse paral parallel parallelogram perpendicular plane polygon PROBLEM produced PROPOSITION quadrilateral radius reckoned rectangle Required RHOMBUS right angles right triangle rods Show solid angles subtending subtract surface tABC tABD termed THEOR theorem triangle ABC Triangles agreeing unequal vertex vols zoid
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