## Elements of plane geometry, book i, containing nearly the same propositions as the first book of Euclid's Elements |

### Inni boken

Side 68

Let ABCDE be any given rectilineal figure , all its interior

Let ABCDE be any given rectilineal figure , all its interior

**angles are equal to twice as many right angles as the figure has**sides wanting four right angles . From F , a point within the figure , draw the straight lines AF , BF , CF ...### Hva folk mener - Skriv en omtale

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Elements of Plane Geometry, Book: Containing Nearly the Same Propositions As ... Euclid Ingen forhåndsvisning tilgjengelig - 2008 |

### Vanlige uttrykk og setninger

ABC is equal AC is equal acute adjacent alternate angles ancient angle ACD angle BAC angles ABC appears application assume axiom base BC bisect called centre circle circumference coincide common conclusion construction definition demonstration describe determined diagonal draw drawn elements employed established Euclid extended exterior angle extremities fall four right angles geometers geometry given straight line greater half Hence included angle interior opposite angle intersect introduced join knowledge less Let ABC magnitudes manner means meet method mind mode necessary obtuse parallel lines parallelogram perpendicular plane position principle problem produced proof properties PROPOSITION proved radiant reason rectangle rectilineal figure remaining respects side AB side AC surfaces THEOR thing third triangle ABC triangles are equal truths unequal vertex wherefore whole

### Populære avsnitt

Side 43 - If two triangles have two sides and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal.

Side 46 - Any two angles of a triangle are together less than two right angles.

Side 37 - The angles which one straight line makes with another upon one tide of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it the angles CBA, ABD ; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a right angle (Def.

Side 57 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.

Side 38 - ... in one and the same straight line. At the point B in the straight line AB, let the two straight lines BC, BD upon the opposite sides of AB, make the adjacent angles ABC, ABD, equal together to two right angles. BD is in the same straight line with CB.

Side 68 - 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.

Side 34 - LET it be granted that a straight line may be drawn from any one point to any other point.

Side 64 - Parallelograms upon the same base, and between the same parallels, are equal to one another.

Side 46 - If one side of a triangle be produced, the exterior angle is greater than either of the interior, and opposite angles.

Side 34 - Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal.