## Elements of Geometry and Conic Sections |

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ABCD altitude angle ABC angle ACB angle BAC base bisected called chord circle circumference coincide College common cone consequently construct contained convex surface curve described diagonals diameter difference distance divided draw drawn ellipse equal equivalent extremities faces fall figure foci focus formed four frustum given greater half hence hyperbola included inscribed intersect join less major axis manner mean measured meet multiplied opposite ordinate parallel parallelogram parallelopiped pass perimeter perpendicular plane plane MN polygon prism PROBLEM Professor Prop proportional PROPOSITION proved pyramid radii radius ratio reason rectangle regular represent right angles Scholium segment sides similar sphere spherical square straight line tangent THEOREM third triangle ABC vertex vertices VIII whole

### Populære avsnitt

Side 30 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.

Side 60 - Any two rectangles are to each other as the products of their bases by their altitudes.

Side 11 - A rhombus, is that which has all its sides equal, but its angles are not right angles.

Side 63 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the' rectangle contained by the parts.

Side 18 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.

Side 20 - therefore, because in the triangles DBC, ACB, DB is equal to AC, and BC common to both, the two sides, DB, BC are equal to the two AC, CB, each to each ; and the angle DBC is equal to...

Side 15 - Wherefore, when a straight line, &c. QED PROP. XIV. THEOR. If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.

Side 148 - It will be shown (p. 7,) that every section of a sphere, made by a plane, is a circle...

Side 14 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles.

Side 152 - THEOREM. The sum of the sides of a spherical polygon is less than the circumference of a great circle.