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inscribed in a polygon, Diameter of a circle, § 142.

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Extremes of a proportion, § 229.

Indirect method of proof, § 50.
Inscribed angle, § 148.

Face angles of a polyedral angle, Inscriptible polygon, § 151.

§ 452.

Faces of a diedral angle, § 428.

of a polyedral angle, § 452.

of a polyedron, § 461.

Figure symmetrical with respect

to a centre, § 390.

Interior angles, § 71.

Inversion, § 236.

Isoperimetric figures, § 378.
Isosceles spherical triangle, § 587.
triangle, § 58.

symmetrical with respect Lateral area of a cone, § 647.

to an axis, § 391.

Figures symmetrical with respect

to a centre, § 388.

symmetrical with respect

to an axis, § 388.

Foot of a line, § 397.
Fourth proportional, § 231.
Frustum of a cone, § 553.
of a pyramid, § 506.
of a pyramid circum-
scribed about a frus-
tum of a cone, § 649.

of a pyramid inscribed

in a frustum of a cone,
§ 649.

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of a cylinder, § 638.

of a frustum of a cone,
§ 647.

of a prism, § 466.

of a pyramid, § 502.

Lateral edges of a prism, § 466.
of a pyramid, § 502.

Lateral faces of a prism, § 466.

of a pyramid, § 502.
Lateral surface of a cone, § 553.
of a cylinder, § 540.
Legs of a right triangle, § 59.
Limit of a variable, § 186.
Line, § 3.

Locus of a series of points, § 141.
Lower base of a frustum of a cone,

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§ 181.

polygons, § 599.

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tangent to a cone, § 553.

circle, § 151.

about a

inscribed in a circle, § 151.

Postulate, § 15.

Prism, § 466.

circumscribed about a cylin-

der, § 639.

inscribed in a cylinder,
§ 639.

Problem, § 15.

Projection of a line on a line,

§ 276.

of a line on a plane,
§ 447.

of a point on a line,
§ 275.

of a point on a plane,

§ 447.

tangent to a cylinder, § 540. Proportion, § 227.

tangent to a frustum of a Proposition, § 15.

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to a circle, § 149.

Pyramid, § 502.

circumscribed about a

cone, § 648.

inscribed in a cone, § 648.

pyramid, § 503.

of contact of a line tangent Quadrangular prism, § 469.

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Quadrant, § 146.
Quadrilateral, § 103.

Radius of a circle, § 142.

of a regular polygon, § 341.
of a sphere, § 561.

Polar distance of a circle of a Ratio, § 180.

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Poles of a circle of a sphere, § 567. Rectilinear figure, § 12.

Polyedral angle, § 452.

Polyedron, § 461.

Re-entrant angle, § 121.

Regular polyedron, § 536.

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Segment of a circle, § 147.

Segments of a line by a point, § 250.

Semicircle, § 147.

Semi-circumference, § 146..

Sides of a polygon, § 118.

of a quadrilateral, § 103.

of a spherical polygon, § 587.
of a triangle, § 57.

of an angle, § 20.

Similar arcs, § 369.

cones of revolution, § 555.
cylinders of revolution,
$ 550.

polyedrons, § 527.

polygons, § 252.

sectors, § 369.

segments, § 369.

Slant height of a cone of revolu-

tion, § 647.

of a frustum of a cone

of revolution, § 647.

divided in extreme
and mean ratio
externally, § 296.
divided in extreme
and mean ratio
internally, § 296.
oblique to a plane,
§ 397.

parallel to a plane,
§ 397.

perpendicular to a

plane, § 397.
tangent to a circle,
§ 149.

tangent to a sphere,
§ 564.

Straight lines divided proportion-
ally, § 243.

Subtended arc, § 147.

Supplement of an angle, § 30.

of a frustum of a regu- Supplementary-adjacent

of an arc, § 190.

angles,

lar pyramid, § 511.

of a regular pyramid,

§ 33.
angles, § 30.

§ 508.

Surface, § 2.

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