Conjugate, from L. conjungo, to yoke or join together; from L. con, together; and L. jugum, that which joins, a yoke. Converge, from F. converger, L. con with; L. vergo, to bend, or incline. Co-ordinate, from L. co (con), together; and L. ordo, inis, a straight row, a regular series. Cube, from L. cubus; G. kubos, a die. Curve, from L. curvus, a, um, crooked, bent. Cylinder, from G. kylindros; from G. kylindō, to roll. Hence roller-like. Decagon, from G. deka, ten; and G. gōnia, an angle (corner). Decimal, from L. decem, ten. Diagonal, from G. diagōnios, from corner to corner. [G. dia, through; and G. gōnia, a corner.] Diagram, from G. diagramma, that which is marked out by lines; from G. dia, round; and G. graphō, to write or delineate. Diameter, from G. diametros, measurement through; from G. dia, through; and G. metron, a measure. Dihedral, from G. di, double; and G. hedra, a base. Dodecagon, from G. dōdeka, twelve; and G. gōnia, an angle (corner). = Duodecimal, from L. duodecim, twelve. [L. duo two, and L. decem = ten.] Elevation, from L. elevo, to lift up or raise; from L. e, up; and L. levo, to raise. Ellipse, from G. elleipsis, a defect or leaving out. [G. elleipo, to leave out.] Equilateral, from L. aequilaterus, equal-sided; from L. aequus, a, um, equal; and L. latus, lateris, a side. Equivalent, from L. aequus, a, um, equal; and L. valens, valentis, being strong. [L. valeo = to be strong.] Focus, from L. focus, a fire-place, hearth. [L. foveo Geometry, from G. yeōmetrō, to measure land; from G. gē, the earth; and G. metro, to measure. Heptagon, from G. heptagōnos, seven-cornered; from G. hepta, seven; and G. gōnia, an angle (corner). Hexagon, from G. hex, six; and G. gōnia, an angle. Horizontal, from G. horizō, to divide or bound. [G. horos a limit.] Hyperbola, from G. hyperbolē, a throwing beyond; from G. hyper, beyond or over; and ballo, to throw. Hypotenuse, from G. hypoteinousa, the line subtending a right angle; from G. hypo, under; and G. teinō, to stretch. Icosahedron, from G. eikosi, twenty; and G. hedra, a base. Intersect, from L. inter, between; and L. seco (sectum), to eut. Involute, from L. involvo, to roll around, wrap up; from L. in, upon; and L. volvo, volutum, to roll. Isosceles, from G. isoskelēs, having equal legs; from G. isos, equal; and G. skelos, a leg. Line, from L. linea, a linen thread. [L. linum flax.] Multilateral, from L. multilaterus, many-sided; from L. multus, a, um, many; and L. latus, lateris, a side. Nonagon, from L. nonus, a, um, the ninth; and G. gōnia, a corner. Oblique, from L. obliquus, a, um, sidelong, slanting. Oblong, from L. oblongus, a, um, rather long. Obtuse, from L. obtusus, a, um, blunt; from L. obtundo, to blunt; from L. ob, against; and L. tundo, to beat. Octagon, from G. oktō, eight; and G. gōnia, an angle. Octahedron, from G. oktō, eight; and G. hedra, a base. Ordinate, from L. ordo, inis, a straight row, a regular series. Parabola, from G. parabolē, a placing beside; from G. para, from, by the side of; and G. ballo, to throw. Parallel, from G. para, by the side of; and G. allelos, one another. [G. allos = another.] Parallelogram, from G. parallēlogrammon, a figure bounded with parallel sides. [G. grammē = a line.] Penetration, from L. penetro (penetratum), to place or set into. Pentagon, from G. pente, five; and G. gōnia, a corner. Perimeter, from G. peri, around; and G. metron, a measure. Periphery, from G. peri, around; and G. pherō, to carry. Perpendicular, from L. perpendiculum, a plumb - line; from L. per, thoroughly; and L. pendo, to weigh. Plane, from L. planus, perfectly flat. Point, from L. punctum, a point, or small hole. [L. pungo to pierce into ] Polygon, from G. polugōnos, a figure having many angles; from G. polus, many; and G. gōnia, a corner. Problem, from G. problēma, that which is proposed; from G. pro, before; and G. ballo, to throw. Profile, from L. pro, forth; and L. filum, a thread. Projection, from L. projicio (projectum), to throw forth or before; from L. pro, forth; and L. jaceo, to throw. Proportional, from L. proportio, symmetry, analogy; from L. pro, in comparison with; and L. portio, portionis, part, share. Pyramid, from G. pyramis, pyramidos, usually derived from G. pyr, a flame, because of its pointed shape. Quadrant, from L. quadrans, -antis, making square; from L. quadro, to make square. [L. quatuor = four.] Quadrilateral, from L. quadrilaterus, four-sided; from L. quatuor, four; and L. latus, lateris, a side. Quatrefoil, from F. quatre, four; and F. feuille, a leaf. Radius, from L. radius, a spoke of a wheel. Ratio, from L. ratio, calculation. [L. reor (ratus), to think, suppose.] Rectilineal, from L. rectus, um, right, straight; and L. linea, a linen thread. [L. linum = flax.] Rhombus, from G. rhombos, a wheel thus shaped, and turned on a pivot. [G. rhembo, to turn round and round.]. Rhomboid, from G. rhombos, and G. eidos, form, shape. Scale, from L. scala, a ladder, flight of steps. [L. scando, to mount.] Sector, from L. sector, one who cuts. [L. seco [G. skazō, to limp.] Segment, from L. segmentum, a piece cut off. [L. seco (sectum), to cut.] Semi-circle, from L. semi, half; and L. circulus, a ring; from G. kirkos, a circle. Sphere, from G. sphaira, a ball or globe. Spiral, from G. speira, anything wound round, a coil. Square, from L. quadro, to make square. [Old F. esquarré, a square; modern F. carré, square.] Superficies, from L. superficies, the upper side, the top; from L. super, above; and L. facies, a face. Tangent, from L. tangens, -entis, touching. [L. tango trace.] = to touch.] Transverse, from L. transversus, lying across; from L. trans, across; and L. verto (versum), to turn. Trapezium, from G. trapezion, dim. of trapeza, a table; contracted either from G. tri-peza, three-legged; or from G. tetra-peza, four-legged. Trapezoid, from G. trapezion, and G. eidos, shape, form. Trefoil, from F. trois, three; and F. feuille, a leaf. Triangle, from L. triangulus, having three corners; from L. tres, three; and L. angulus, a corner. Trilateral, from L. trilaterus, having three sides; from L. tres, three; and L. latus, lateris, a side. Trisect, from L. tres, three; and L. seco (sectum), to cut. Vertex, from L. vertex, the top or crown of the head. [L. verto = to turn.] Vertical, from L. vertex (verticis), the top of the head. Volute, from L. volvo (volutum), to roll. INDEX TO PROBLEMS IN PLANE GEOMETRY. PAGE 25 10 11 11 13 ... ... 14 14 10 6 54 55 170 45 45 46 48 49 98 98 99 ... ; to make, equal to given angle, from given point, in the given ; to make, equal to given angle, from given point, outside the ; to bisect, made by two converging lines, the angular point tangential; to draw, to two given circles, touching one of the of a circle; to describe, tangential to two given converging ; to describe, tangential to given arc and given line, Circle; to find centre of, ... ... ; to describe, passing through three given points, ... ... ; to describe, passing through given point, and tangential to ; to describe, of given radius, touching two given circles, ; to describe, of given radius, tangential to two converging lines, |