. Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . itude, or height, of a figure, is a perpendicular let fall fromits vertex, or highest point, to the opposite side or end, its base. The Base of a triangle is that side that is placed parallel to thehorizon ; and of figures in general the base is that end, or side, uponwhich the figure is supposed to stand or rest. The sides of a triangleare often called the legs. In a right-angled triangle, the longest side,or line which subtend
. Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . itude, or height, of a figure, is a perpendicular let fall fromits vertex, or highest point, to the opposite side or end, its base. The Base of a triangle is that side that is placed parallel to thehorizon ; and of figures in general the base is that end, or side, uponwhich the figure is supposed to stand or rest. The sides of a triangleare often called the legs. In a right-angled triangle, the longest side,or line which subtends the right angle, is called the hypotenuse, andof the other two sides, one is the base, and the other the perpendic-ular. A Circle is a plane figure, boundedby a curve line, called the circumfer-ence or periphery, every part of whichisequi-distantfrom a point within calledthe centre, as AC B D, in the circumference itself is often calleda circle. The Radius — semi-diameter — is aline drawn from the centre to the cir-cumference, as 0 A, or O C. The Diameter is a line drawn fromthe circumference through the centre to the opposite side, as A B15 *. 174 GEOMETRY, A Semicircle is half a circle, or it is half the circumference of acircle, as ACB. A Quadrant is a quarter of a circle. It is also sometimes a quar-ter of the circumference, as A C. An Arc is any portion of the circumference, as B c a, or li C g. A Chord, or subtense, is a right line joining the extremities of anarc, as B a, or h g. A Segment is the portion of a circle contained between the arcand its chord, as the space between the arc B c a and its chord B a,or between the arc h 1) g, or h C g, and the chord h g. A Sector is the space between two radii, or lines passing from thecentre to the circumference, as the space B O a. A Secant is a line that cuts another line. In trigonometry, thesecant of an arc is a right line drawn from the centre of a circlethrough one end of the arc, and terminated by a tang
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