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. kylindo, to roll. Hence roller-like. Decagon, from G. deka, ten ; and G. gònia, an angle (corner). G. gônia, a corner.] dia, round; and G. graphò, to write or delineate. Diameter, from G. diametros, measurement through ; from G. dia, through ; and G. metrun, a measure. Dihedral, from G. di, double ; and G. hedra, a base. Dodecagon, from G. dõdeka, twelve ; and G. gônia, an angle (corner). Dodecahedron, from G. dõdeka, twelve; and G. hedra, a base. 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.] Hypotenuse, from G. hypoteinousa, the line subtending a right angle; from G. hypo, under; and G. teino, to stretch. Icosahedron, from G. eikosi, twenty; and G. hedra, a base. L. volvo, volutum, to roll. 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. gònia, a corner. 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. gônia, a corner. Perimeter, from G. peri, around; and G. metron, a measure. Periphery, froin G. peri, around; and G. phero, 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. polugonos, a figure having many angles ; from G. polus, many; and G. gònia, a corner. Prism, from G. prisma. [G. prizo = 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 com parison 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. Radius, from L. radius, a spoke of a wheel. 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 mnount.] a circle. 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.] 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. L. latus, lateris, a side. Vertex, from L. vertex, the top or crown of the head. [L. verto = to turn.] INDEX TO PROBLEMS IN PLANE GEOMETRY. PAGE 25 10 14 14 ... 55 Altitude; to find, of given triangle, ... ... line, ... ... ... ... ... ... ... given line, ... ... ... ... ... : being inaccessible; ... given ciroles in a given point, ... lines, ... ... ... ... ... ... given line, .. ; to describe, of given radius, touching two given circles, -; to describe, about given square, ... ; to draw, touching given circle in given point, also a given line, 170 ::::::::::: 99 100 |