## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh and Twelfth |

### From inside the book

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66 A plane angle is the inclination of two lines to one “ another in a plane , which meet together , but are 66 not ... on another straight line makes the adjacent angles equal to one another , each of the angles is called a

66 A plane angle is the inclination of two lines to one “ another in a plane , which meet together , but are 66 not ... on another straight line makes the adjacent angles equal to one another , each of the angles is called a

**right angle**... Page 4

A

A

**right angled**triangle , is that which has a**right angle**. XXVIII . An obtuse angled triangle , is that which has an obtuse angle . AA XXIX . An acute angled triangle , is that which has three acute angles . XXX . Page 6

All

All

**right angles**are equal to one another . XII . “ If a straight line meet two , straight lines , so as to 66 make the two interior angles on the same side of " it taken together less than two**right angles**, these “ straight lines ... Page 13

A To bisect a given rectilineal angle , that is , to divide it into two equal angles . Let BAC be the given rectilineal angle ... To draw a straight line at

A To bisect a given rectilineal angle , that is , to divide it into two equal angles . Let BAC be the given rectilineal angle ... To draw a straight line at

**right angles**to a given straight line , from a given point in the same . Page 14

The straight line FC drawn from the given point C , shall be at

The straight line FC drawn from the given point C , shall be at

**right angles**to the given straight line AB . ... base DF is equal t to the base EF ; therefore the angle DCF is equal * to the angle ECF ; and they are adjacent angles .### What people are saying - Write a review

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The Elements of Euclid: Viz. The First Six Books, Together With the Eleventh ... Euclid Euclid No preview available - 2018 |

### Common terms and phrases

added altitude angle ABC angle BAC base Book centre circle circle ABCD circumference common cone contained cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular equimultiples Euclid excess figure fore four fourth given angle given in position given in species given magnitude given ratio given straight line greater Greek half join less likewise logarithm magnitude manner meet multiple opposite parallel parallelogram pass perpendicular plane prism produced PROP proportionals proposition proved pyramid radius reason rectangle rectilineal figure remaining right angles segment shewn sides similar sine solid sphere square square of AC taken THEOR third triangle ABC wherefore whole