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.] = Figure, from L. figura, a shape. [L. fingo = to form.] to heat.] Geometry, from G. yeōmetrō, to measure land; from G. gē, the earth; and G. metro, to measure. Heptagon, from G. heptagonos, 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. hyperbole, 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. Oval, from L. ovum, an egg. Hence egg-shaped. 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. Prism, from G. prisma. [G. prizō to saw.] = 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, a, 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 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 ... ... ... ... right, to trisect, ... ... ; ... ... ; 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 Arc; to bisect, 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, -; to describe, passing through three given points, ; to describe, passing through given point, and tangential to ; to describe, touching two given circles, ; to describe, of given radius, touching two given circles, ; to inscribe, within given triangle, 25 10 11 11 ; to inscribe, within given square, 98 ; to describe, of given radius, tangential to two converging lines, 169 171 |