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Fig. 35 Fig. 36 Fig. 37 Fig. 38 9-7 MECHANICAL AND ENGINEERING DRAWING Of four-sided figures bounded by straight lines A square has all its sides equal, and its angles right angles, as in Fig. 29. A rectangle has opposite sides pairs, and parallel, and its angles right angles, as in Fig. 30. A parallelogram, or rhomboid, has two pairs of parallel sides, as Fig. 31. A rhombus has all its sides equal, two of its angles being acute, as Fig. 32. A trapezoid has only two sides parallel, as Fig. 33. A trapezium is an irregular figure of four sides, none of which are parallel, as Fig. 34. A regular polygon is a figure having all its sides and angles equal. One of five sides is a pentagon, as Fig. 35. One of six, a hexagon, as Fig. 36. One of eight sides, an octagon, as Fig. 37. An irregular polygon is a figure whose sides and angles are unequal. The centre of a polygon is a point that is equi-distant from its sides and its angular points. A polygon is circumscribed when all its angular points touch a circle described about it, as in Fig. 38. A circle is inscribed in a polygon when its circumference touches all the sides of the polygon, as in Fig. 39. Fig. 39 Fig. 40 Fig. 41 A right or straight-lined figure is described about a circle when all the sides of the figure touch the circumference of the circle, as in Fig. 40 ; and a straight-lined figure is inscribed in another such figure when the angular points of the inscribed figure are upon the sides of the