First book of mathematics |
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Common terms and phrases
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
Popular passages
Page 7 - The circumference of every circle is supposed to be divided into...
Page 50 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.
Page 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.
Page 41 - Parallelograms on the same base, and between the same parallels, are equal to one another.
Page 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.
Page 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.
Page 120 - Divide the area by . 7854 and extract the square root of the quotient.
Page 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.
Page 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.
Page 6 - It is a line every point of which is at the same distance from a point within it called the centre.