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ABCD altitude angles are equal apply approaches base bisects called centre chord circle circumference circumscribed coincide common cone construct contains conversely corresponding cylinder describe diagonals diameter diedral angles difference distance divided draw drawn edges equal equivalent Exercise Exercise.—The extremities faces fall figure Find formed four frustum given given point GIVEN—the greater half Hence homologous hypotenuse included indefinitely inscribed intersection isosceles Join lateral area length less limit locus mean measured meet method middle point parallelogram parallelopiped passed perimeter perpendicular Place plane polygon position prism proportional PROPOSITION PROVE pyramid radii radius ratio rectangle regular polygon respectively right angles right triangle segment sides similar sphere square straight line surface symmetrical tangent THEOREM third triangle triangle ABC triangular unequal unit vertex vertices volume
Σελίδα 102 - If a line divides two sides of a triangle proportionally, it is parallel to the third side.
Σελίδα 173 - The area of a regular polygon is equal to onehalf the product of its apothem and perimeter.
Σελίδα 79 - The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles.
Σελίδα 50 - If the opposite sides of a quadrilateral are equal, the figure is a parallelogram.
Σελίδα 121 - In any obtuse triangle, the square of the side opposite the obtuse angle is equal to the sum of the squares of the other two sides, increased by twice the product of one of these sides and the projection of the other side upon it.
Σελίδα 118 - If from a point without a circle a tangent and a secant be drawn, the tangent is a mean proportional between the whole secant and its external segment.
Σελίδα 47 - Two oblique lines cutting off equal distances from the foot of the perpendicular are equal.
Σελίδα 314 - Similar cylinders are to each other as the cubes of their altitudes, or as the cubes of the diameters of their bases.