# Observational Geometry

American Book Company, 1899 - Geometry - 240 pages
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### Popular passages

Page 185 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Page 50 - The formula states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the base and altitude.
Page 221 - The areas of two similar triangles (or polygons) are to each other as the squares of any two corresponding sides.
Page 89 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Page 186 - The area of a triangle is equal to one-half the product of its base and altitude.
Page 115 - The area of the surface of a sphere is four times the area of a great circle.
Page 54 - The square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.
Page 166 - AB of the circle into as many equal parts as the polygon is to have sides. With the points A and B as centers and radius AB, describe arcs cutting each other at C.
Page 188 - Hence the area of a trapezoid is equal to its altitude, multiplied by the line which joins the middle points of the sides which are not parallel.
Page 107 - The volume of a cylinder is equal to the area of its base multiplied by the altitude.