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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. gònia, a corner.]
dia, round; and G. grapho, 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. gònia, an angle (corner). Dodecahedron, from G. dõdeka, twelve; and G. hedra, a base. Duodecimal, from L. duodecim, twelve. [L. duo two, and L. decem
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.]
Geometry, from G. yeometro, to measure land; from G. gē, the earth ; and
G. metro, to measure.
Heptagon, from G. heptugānos, seven-cornered; from G. hepta, seven; and
G. gônia, an angle (corner). Hexagon, from G. hex, six; and G. gônia, an angle. Horizontal, from G. horizo, to divide or bound. [G. horos = a limit.] Hyperbola, from G. hyperbolė, a throwing beyond; from G. hyper, beyond Hypotenuse, from G. hypoteinousa, the line subtending a right angle; from
or over; and ballo, to throw.
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.
Oblique, from L. obliquus, a, um, sidelong, slanting.
L. ob, against ; and L. tundo, to beat.
Parabola, from G. parabolē, a placing beside; from G. para, from, by the Problem, from G. problēma, that which is proposed; from G. pro, before ;
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. gònia, 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. gônia, a corner. Prism, from G. prisma. [G. prizo = to saw.]
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.]
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.
Altitude; to find, of given triangle,
of 45° ; to construct, on given line,
right, to trisect,
tangential; to draw, to two given circles, touching one of the
given circles in a given point,
-; to describe, passing through three given points,