The first six books of the Elements of Euclid, with numerous exercises |
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Αποτελέσματα 1 - 5 από τα 66.
Σελίδα 2
An obtuse angle is that which is greater than a right angle . XII . An acute angle is that which is less than a right angle . Obtuse . Acute . XIII . A term or boundary is the extremity of any thing . XIV .
An obtuse angle is that which is greater than a right angle . XII . An acute angle is that which is less than a right angle . Obtuse . Acute . XIII . A term or boundary is the extremity of any thing . XIV .
Σελίδα 3
A right - angled triangle is that which has a right angle . XXVIII . An obtuse - angled triangle ... Of four - sided figures , a square is that which has all its sides equal , and all its angles right angles . Square . Oblong . XXXI .
A right - angled triangle is that which has a right angle . XXVIII . An obtuse - angled triangle ... Of four - sided figures , a square is that which has all its sides equal , and all its angles right angles . Square . Oblong . XXXI .
Σελίδα 4
All right angles are equal to one another . XII . If a straight line meets two straight lines , so as to make the two interior angles on the same side of it taken together less than two right angles , these straight lines being ...
All right angles are equal to one another . XII . If a straight line meets two straight lines , so as to make the two interior angles on the same side of it taken together less than two right angles , these straight lines being ...
Σελίδα 10
9 ) the angle ac b by the straight line cd . ab is cut into two equal parts in the point d . Because a c is equal to cb ... PROBLEM . a To draw a straight line at right angles to a given straight line , from a given point in the same .
9 ) the angle ac b by the straight line cd . ab is cut into two equal parts in the point d . Because a c is equal to cb ... PROBLEM . a To draw a straight line at right angles to a given straight line , from a given point in the same .
Σελίδα 11
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 . LET the straight line a b make with cd , upon one side of it , the angles cba ...
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 . LET the straight line a b make with cd , upon one side of it , the angles cba ...
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a b c angle a b c angle bac base base bc bc is equal bisected centre circle circumference common compounded definition demonstrated describe diameter divided double draw equal angles equal to f equiangular equilateral equimultiples exterior angle extremity fall fore four fourth given straight line greater half ILLUSTRATED inscribe join less likewise magnitudes manner meet multiple parallel parallelogram pass perpendicular produced proportionals PROPOSITION ratio reason rectangle contained rectilineal figure remaining angle right angles segment shewn sides similar square square of a c straight line a b Take taken third touches the circle triangle triangle a b c wherefore whole