# The mechanic's and schoolboy's steps to the mathematics, the science of geometry arranged on a novel principle

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Page 58 - But, if the angle C be not a right angle; at the point A, in the straight line AB, make * the angle BAD equal to the angle C...
Page 4 - A plane rectilineal angle is the inclination of two straight lines to one another in a plane which meet together, but are not in the same straight line as in Fig.
Page 74 - The frustum of a cone is the part ih.n remains, when the top is cut off by a plane parallel to the base ; and is otherwise called a truncated cone.
Page 76 - ... or practice. The real inventor of this valuable instrument is unknown ; yet of so much merit has the invention appeared, that it was claimed by Galileo, and disputed by nations. This instrument derives its name from the tenth definition of the third book of Euclid, where he defines the sector of a circle. It is formed of two equal rules called legs ; these legs are...
Page 9 - Fig. 14. bound it. 34. A CIRCLE is a plane figure bounded by a curved line, called the Circumference or Periphery ; which is every where equally distant from a certain point within it, called the CENTRE. An ARC is any part of the circumference. 35. The DIAMETER of a circle, is a straight line drawn through the centre and terminating in the circumference on each side.
Page 74 - In optics, the focus of a glass is the point of convergence or concourse, where the rays meet and cross the axis after their refraction by the glass.