. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. Fig. 16. Hexagon. Fig. 17. Octagon. Polygons are classified according to the number of triangle is a polygon of three quadrilateral is a polygon of four pentagon is a polygon of five sides, Fig. hexagon is a polygon of six sides, Fig. octagon is a polygon of eight sides, Fig. equilateral polygon is one all of whose sides are equiangular polygon is one all of who
. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. Fig. 16. Hexagon. Fig. 17. Octagon. Polygons are classified according to the number of triangle is a polygon of three quadrilateral is a polygon of four pentagon is a polygon of five sides, Fig. hexagon is a polygon of six sides, Fig. octagon is a polygon of eight sides, Fig. equilateral polygon is one all of whose sides are equiangular polygon is one all of whose angles are regular polygon is one all of whose angles and all of whosesides are equal. TRIANGLES 78. A triangle is a polygon enclosed by three straight lines calledsides. The angles of a triangle are the angles formed by the sides. A a. Fig. 18. Right-AngledTriangle. Fig. 19. Acute-AngledTriangle. Obtuse-AngledTriangle. A right-angled triangle, often called a right triangle, Fig. 18,is one that has a right angle. The longest side (the one opposite theright angle) is called the hypotenuse and the other sides are some-times called legs. An acute-angled triangle, Fig. 19, is one that has all of its anglesacute. An obtuse-angled triangle, Fig. 20, is one that has an obtuse angle. PRACTICAL MATHEMATICS 103 An equilateral triangle, Fig. 21, is one having all of its sides equal. An equiangular triangle is one having all of its angles equal. An isosceles triangle, Fig. 22, is one two of whose sides are equal. A scalene triangle, Fig. 23, is one no two of whose sides are equal. (a) The base of a triangle is the lowest side; it is the side uponwhich the triangle is supposed to stand. Any side may, however, betaken as the base. In an isosceles triangle, the side which is not oneof the equal sides is usually considered as the ba
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