Carpentry for Boys / In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations

by James Slough Zerbe

173. Polygons.—Many-sided and many with angles.

174. Pyramid.—A solid structure generally with a square base and having its sides meeting in an apex or peak. The peak is the vertex.

175. Quadrant.—The quarter of a circle or of the circumference of a circle. A horizontal line, A, and a vertical line, B, make the four quadrants, like C.

176. Quadrilateral.—A plane figure having four sides, and consequently four angles. Any figure formed by four lines.

177. Rhomb.—An equilateral parallelogram or a quadrilateral figure whose sides are equal and the opposite sides, B, B, parallel.

178. Sector.—A part, A, of a circle formed by two radial lines, B, B, and bounded at the end by a curve.

179. Segment.—A part, A, cut from a circle by a straight line, B. The straight line, B, is the chord or the segmental line.

180. Sinusoid.—A wave-like form. It may be regular or irregular.

181. Tangent.—A line, A, running out from the curve at right angles from a radial line.

182. Tetrahedron.—A solid figure enclosed or bounded by four triangles, like A or B. A plain pyramid is bounded by five triangles.