First book of mathematicsA. & C. Black, 1872 - 124 σελίδες |
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Αποτελέσματα 1 - 5 από τα 7.
Σελίδα 10
... angle , as E , fig . 4 , p . 6 , if it is a right angle , this will be best seen by producing ( lengthening out ) ... ACUTE ANGLE is less than a right angle . 52. AN OBTUSE ANGLE is greater than a right angle . In fig . 4 , p . 6 , the ...
... angle , as E , fig . 4 , p . 6 , if it is a right angle , this will be best seen by producing ( lengthening out ) ... ACUTE ANGLE is less than a right angle . 52. AN OBTUSE ANGLE is greater than a right angle . In fig . 4 , p . 6 , the ...
Σελίδα 28
... ACUTE ANGLED TRIANGLE has all its angles acute . 99. AN OBTUSE ANGLED TRIANGLE has one obtuse angle . A triangle can only have one obtuse angle . Fig . 23 is an acute angled triangle . Both triangles , ABC , in fig . 24 , are obtuse ...
... ACUTE ANGLED TRIANGLE has all its angles acute . 99. AN OBTUSE ANGLED TRIANGLE has one obtuse angle . A triangle can only have one obtuse angle . Fig . 23 is an acute angled triangle . Both triangles , ABC , in fig . 24 , are obtuse ...
Σελίδα 35
... angles equal , each to each , to like parts in the given triangle ; for- Two triangles are equal in all respects ... angle are given . ( 1. ) When the given side is between the two given angles ( right and acute ) ; as , AC , and the ...
... angles equal , each to each , to like parts in the given triangle ; for- Two triangles are equal in all respects ... angle are given . ( 1. ) When the given side is between the two given angles ( right and acute ) ; as , AC , and the ...
Σελίδα 36
... acute angle ; as , AC and the angle required at B. B At A and C draw AD and CB perpendicular to AC . At A in the line AD , make the angle DAB equal to the given acute angle , producing AB till it meets the perpendicular at C in B. И A The ...
... acute angle ; as , AC and the angle required at B. B At A and C draw AD and CB perpendicular to AC . At A in the line AD , make the angle DAB equal to the given acute angle , producing AB till it meets the perpendicular at C in B. И A The ...
Σελίδα 37
Hugo Reid. angles , the two acute angles must be together equal to one right angle ; and one of them is equal to the differ- ence between the other and one right angle . Note 2. - In every right - angled triangle , the half of the ...
Hugo Reid. angles , the two acute angles must be together equal to one right angle ; and one of them is equal to the differ- ence between the other and one right angle . Note 2. - In every right - angled triangle , the half of the ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD acres acute angle added altitude angle equal angular points base Bisect called centre chord circle circumference construct contained denotes diagonal diameter difference distance divide divisor draw drawn edge ends equal equal angles equation equidistant Examples Exercises expressed extract feet field figure Find the area foot formula four geometrical given angle given line given point given straight line given triangle gives half hypotenuse inches inscribed Join known length less letters mark means measure meet multiply Note number of degrees opposite side parallel parallel lines parallelogram perpendicular placed plane poles preceding Problem produced proportion quadrilateral quantity radius ratio rectangle regular polygon respects right angles right-angled triangle rood round rule sides similar square square root stands straight line subtracted surface taken term third usually whole yards
Δημοφιλή αποσπάσματα
Σελίδα 7 - The circumference of every circle is supposed to be divided into...
Σελίδα 50 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.
Σελίδα 5 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Σελίδα 41 - Parallelograms on the same base, and between the same parallels, are equal to one another.
Σελίδα 61 - Quadrilateral ; of five sides a Pentagon ; of six sides a Hexagon ; of seven sides a Heptagon ; of eight sides an Octagon ; of nine sides a Nonagon ; of ten sides a Decagon ; of twelve sides a Dodecagon.
Σελίδα 114 - Polygons are those which have more than four sides. They receive particular names from the number of their sides ; thus a pentagon has five sides, a hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine, a decagon ten, an undecagon eleven, and a dodecagon has twelve sides.
Σελίδα 120 - Divide the area by . 7854 and extract the square root of the quotient.
Σελίδα 84 - To rearrange an equation you can • add the same quantity to both sides • subtract the same quantity from both sides • multiply both sides by the same quantity • divide both sides by the same quantity.
Σελίδα 109 - Find the area of a field in the form of a trapezoid whose altitude is 120 m and whose parallel sides are 130 m and 180 m.
Σελίδα 6 - It is a line every point of which is at the same distance from a point within it called the centre.