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ABCD altitude axis base called centre chord circle circumference circumscribed coincide common cone consequently construct corresponding cosine Cotang cylinder denote described diameter difference distance divided draw drawn edges equal EXAMPLES extremity faces feet figure formed Formula four frustum functions given greater half hence homologous included inscribed intersection less logarithm manner mean measured meet multiplied OPERATION opposite parallel parallelogram parallelopipedon pass perpendicular placed plane plane MN pole polyedron polygon position prism PROBLEM proportional PROPOSITION proved pyramid quadrant radii radius rectangle regular remaining right angles RULE Scholium segment shown sides similar sine solution sphere spherical triangle square straight line surface taken tangent term THEOREM third triangle triangle ABC unit vertex vertices volume whence
Página 99 - The area of a parallelogram is equal to the product of its base and altitude.
Página 46 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Página 104 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
Página 31 - THEOREM. If two angles of a triangle are equal, the sides opposite to them are also equal, and consequently, the triangle is isosceles.
Página 16 - A SCALENE TRIANGLE is one which has no two of its sides equal ; as the triangle GH I.
Página 28 - If two triangles have two sides of the one equal to two sides of the other, each to each, and the included angles unequal, the third sides will be unequal; and the greater side will belong to the triangle which has the greater included angle.
Página 154 - DE, are like parts of the circumferences to which they belong, and similar sectors, as A CH and 'D OE, are like parts of the circles to which they belong : hence, similar arcs are to each other as their radii, and similar sectors are to each other as the squares of their radii.